diff --git a/lib/Alchemy/Phrasea/Command/Developer/RegenerateSqliteDb.php b/lib/Alchemy/Phrasea/Command/Developer/RegenerateSqliteDb.php
index fa9f4e5037..a9b210b850 100644
--- a/lib/Alchemy/Phrasea/Command/Developer/RegenerateSqliteDb.php
+++ b/lib/Alchemy/Phrasea/Command/Developer/RegenerateSqliteDb.php
@@ -13,6 +13,7 @@ namespace Alchemy\Phrasea\Command\Developer;
 
 use Alchemy\Phrasea\Border\Manager;
 use Alchemy\Phrasea\Command\Command;
+use Alchemy\Phrasea\Media\SubdefSubstituer;
 use Alchemy\Phrasea\Model\Entities\ApiApplication;
 use Alchemy\Phrasea\Model\Entities\AuthFailure;
 use Alchemy\Phrasea\Model\Entities\AggregateToken;
@@ -280,7 +281,9 @@ class RegenerateSqliteDb extends Command
             $DI['lazaret_1'] = $element;
         };
 
-        $this->container['border-manager']->process($session, $file, $callback, Manager::FORCE_LAZARET);
+        /** @var Manager $borderManager */
+        $borderManager = $this->container['border-manager'];
+        $borderManager->process($session, $file, $callback, Manager::FORCE_LAZARET);
     }
 
     private function generateUsers(EntityManager $em, \Pimple $DI)
@@ -368,7 +371,8 @@ class RegenerateSqliteDb extends Command
 
     private function generateCollection(\Pimple $DI)
     {
-        $coll = $collection_no_acces = $collection_no_acces_by_status = $db = null;
+        $coll = $collection_no_acces = $collection_no_acces_by_status = null;
+        /** @var \databox[] $databoxes */
         $databoxes = $this->container['phraseanet.appbox']->get_databoxes();
 
         foreach ($databoxes as $databox) {
@@ -390,16 +394,15 @@ class RegenerateSqliteDb extends Command
             }
         }
 
-        $DI['databox'] = $coll->get_databox();
+        $DI['databox'] = $databox = $coll->get_databox();
         $DI['coll'] = $coll;
-
-        if (!$collection_no_acces instanceof collection) {
+        if (!$collection_no_acces instanceof \collection) {
             $collection_no_acces = \collection::create($this->container, $databox, $this->container['phraseanet.appbox'], 'COLL_TEST_NO_ACCESS', $DI['user']);
         }
 
         $DI['coll_no_access'] = $collection_no_acces;
 
-        if (!$collection_no_acces_by_status instanceof collection) {
+        if (!$collection_no_acces_by_status instanceof \collection) {
             $collection_no_acces_by_status = \collection::create($this->container, $databox, $this->container['phraseanet.appbox'], 'COLL_TEST_NO_ACCESS_BY_STATUS', $DI['user']);
         }
 
@@ -420,8 +423,10 @@ class RegenerateSqliteDb extends Command
         foreach (range(1, 3) as $i) {
             $story = \record_adapter::createStory($this->container, $DI['coll']);
             if ($i < 3) {
-                $this->container['subdef.substituer']->substitute($story, 'preview', $media);
-                $this->container['subdef.substituer']->substitute($story, 'thumbnail', $media);
+                /** @var SubdefSubstituer $substituer */
+                $substituer = $this->container['subdef.substituer'];
+                $substituer->substitute($story, 'preview', $media);
+                $substituer->substitute($story, 'thumbnail', $media);
             }
             $DI['record_story_' . $i] = $story;
         }
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php
index a6fc9eab2f..2c2ee92024 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php
@@ -14,6 +14,10 @@ class Structure
     private $facets = array();
     private $aliases = array();
 
+    /**
+     * @param \databox[] $databoxes
+     * @return self
+     */
     public static function createFromDataboxes(array $databoxes)
     {
         $structure = new self();
diff --git a/lib/classes/ACL.php b/lib/classes/ACL.php
index a41834240f..c41e691613 100644
--- a/lib/classes/ACL.php
+++ b/lib/classes/ACL.php
@@ -822,8 +822,17 @@ class ACL implements cache_cacheableInterface
         }
 
         try {
-            $this->_global_rights = $this->get_data_from_cache(self::CACHE_GLOBAL_RIGHTS);
-            $this->_rights_sbas = $this->get_data_from_cache(self::CACHE_RIGHTS_SBAS);
+            $global_rights = $this->get_data_from_cache(self::CACHE_GLOBAL_RIGHTS);
+            if (!is_array($global_rights)) {
+                throw new Exception('global rights were not properly retrieved');
+            }
+            $sbas_rights = $this->get_data_from_cache(self::CACHE_RIGHTS_SBAS);
+            if (!is_array($sbas_rights)) {
+                throw new Exception('sbas rights were not properly retrieved');
+            }
+
+            $this->_global_rights = $global_rights;
+            $this->_rights_sbas = $sbas_rights;
 
             return $this;
         } catch (\Exception $e) {
@@ -880,9 +889,21 @@ class ACL implements cache_cacheableInterface
         }
 
         try {
-            $this->_global_rights = $this->get_data_from_cache(self::CACHE_GLOBAL_RIGHTS);
-            $this->_rights_bas = $this->get_data_from_cache(self::CACHE_RIGHTS_BAS);
-            $this->_limited = $this->get_data_from_cache(self::CACHE_LIMITS_BAS);
+            $data = $this->get_data_from_cache(self::CACHE_GLOBAL_RIGHTS);
+            if (!is_array($data)) {
+                throw new Exception('Unable to retrieve global rights');
+            }
+            $this->_global_rights = $data;
+            $data = $this->get_data_from_cache(self::CACHE_RIGHTS_BAS);
+            if (!is_array($data)) {
+                throw new Exception('Unable to retrieve base rights');
+            }
+            $this->_rights_bas = $data;
+            $data = $this->get_data_from_cache(self::CACHE_LIMITS_BAS);
+            if (!is_array($data)) {
+                throw new Exception('Unable to retrieve limits rights');
+            }
+            $this->_limited = $data;
 
             return $this;
         } catch (\Exception $e) {
diff --git a/lib/classes/appbox.php b/lib/classes/appbox.php
index 9fcc61e52d..039c0845cf 100644
--- a/lib/classes/appbox.php
+++ b/lib/classes/appbox.php
@@ -371,7 +371,7 @@ class appbox extends base
                 }
                 $ret[$sbas_id] = $databox;
             } catch (NotFoundHttpException $e) {
-                $this->app['monolog']->error(sprintf('Databox %s is not reliable.', $databox->get_sbas_id()));
+                $this->app['monolog']->error(sprintf('Databox %s is not reliable.', $sbas_id));
             }
         }
 
@@ -383,7 +383,10 @@ class appbox extends base
     protected function retrieve_sbas_ids()
     {
         try {
-            return $this->get_data_from_cache(self::CACHE_SBAS_IDS);
+            $data = $this->get_data_from_cache(self::CACHE_SBAS_IDS);
+            if (is_array($data)) {
+                return $data;
+            }
         } catch (\Exception $e) {
 
         }
diff --git a/lib/classes/collection.php b/lib/classes/collection.php
index e7b26f48c1..77f93f6ae3 100644
--- a/lib/classes/collection.php
+++ b/lib/classes/collection.php
@@ -64,6 +64,9 @@ class collection implements cache_cacheableInterface
     {
         try {
             $datas = $this->get_data_from_cache();
+            if (!is_array($datas)) {
+                throw new \Exception('Collection could not be retrieved from cache');
+            }
             $this->is_active = $datas['is_active'];
             $this->base_id = $datas['base_id'];
             $this->available = $datas['available'];
diff --git a/lib/classes/databox.php b/lib/classes/databox.php
index 17918d526a..a06e33e398 100644
--- a/lib/classes/databox.php
+++ b/lib/classes/databox.php
@@ -230,7 +230,10 @@ class databox extends base
     protected function get_available_collections()
     {
         try {
-            return $this->get_data_from_cache(self::CACHE_COLLECTIONS);
+            $data = $this->get_data_from_cache(self::CACHE_COLLECTIONS);
+            if (is_array($data)) {
+                return $data;
+            }
         } catch (\Exception $e) {
 
         }
@@ -551,13 +554,15 @@ class databox extends base
             , ':password' => $password
         ];
 
-        $stmt = $app['phraseanet.appbox']->get_connection()->prepare($sql);
+        /** @var appbox $appbox */
+        $appbox = $app['phraseanet.appbox'];
+        $stmt = $appbox->get_connection()->prepare($sql);
         $stmt->execute($params);
         $row = $stmt->fetch(PDO::FETCH_ASSOC);
         $stmt->closeCursor();
 
         if ($row) {
-            return $app['phraseanet.appbox']->get_databox((int) $row['sbas_id']);
+            return $appbox->get_databox((int) $row['sbas_id']);
         }
 
         try {
@@ -576,7 +581,7 @@ class databox extends base
         $stmt->closeCursor();
 
         $sql = 'SELECT MAX(ord) as ord FROM sbas';
-        $stmt = $app['phraseanet.appbox']->get_connection()->prepare($sql);
+        $stmt = $appbox->get_connection()->prepare($sql);
         $stmt->execute();
         $row = $stmt->fetch(PDO::FETCH_ASSOC);
         $stmt->closeCursor();
@@ -588,10 +593,10 @@ class databox extends base
 
         $sql = 'INSERT INTO sbas (sbas_id, ord, host, port, dbname, sqlengine, user, pwd)
               VALUES (null, :ord, :host, :port, :dbname, "MYSQL", :user, :password)';
-        $stmt = $app['phraseanet.appbox']->get_connection()->prepare($sql);
+        $stmt = $appbox->get_connection()->prepare($sql);
         $stmt->execute($params);
         $stmt->closeCursor();
-        $sbas_id = (int) $app['phraseanet.appbox']->get_connection()->lastInsertId();
+        $sbas_id = (int) $appbox->get_connection()->lastInsertId();
 
         $app['orm.add']([
             'host'     => $host,
@@ -601,9 +606,9 @@ class databox extends base
             'password' => $password
         ]);
 
-        $app['phraseanet.appbox']->delete_data_from_cache(appbox::CACHE_LIST_BASES);
+        $appbox->delete_data_from_cache(appbox::CACHE_LIST_BASES);
 
-        $databox = $app['phraseanet.appbox']->get_databox($sbas_id);
+        $databox = $appbox->get_databox($sbas_id);
         $databox->insert_datas();
 
         $databox->setNewStructure(
@@ -688,15 +693,18 @@ class databox extends base
      */
     public function get_meta_structure()
     {
-        $metaStructData = array();
-
         if ($this->meta_struct) {
             return $this->meta_struct;
         }
 
         try {
             $metaStructData = $this->get_data_from_cache(self::CACHE_META_STRUCT);
+            if (!is_array($metaStructData)) {
+                throw new Exception('Invalid metaStructData');
+            }
         } catch (\Exception $e) {
+            $metaStructData = array();
+
             $sql = 'SELECT id, `name` FROM metadatas_structure ORDER BY sorter ASC';
             $stmt = $this->get_connection()->prepare($sql);
             $stmt->execute();
@@ -711,7 +719,7 @@ class databox extends base
 
         $this->meta_struct = new databox_descriptionStructure();
 
-        foreach ((array) $metaStructData as $row) {
+        foreach ($metaStructData as $row) {
             $this->meta_struct->add_element(databox_field::get_instance($this->app, $this, $row['id']));
         }
 
@@ -1219,7 +1227,10 @@ class databox extends base
     protected function retrieve_structure()
     {
         try {
-            return $this->get_data_from_cache(self::CACHE_STRUCTURE);
+            $data = $this->get_data_from_cache(self::CACHE_STRUCTURE);
+            if (is_array($data)) {
+                return $data;
+            }
         } catch (\Exception $e) {
 
         }
diff --git a/lib/classes/databox/subdefsStructure.php b/lib/classes/databox/subdefsStructure.php
index e2904f0863..60e8cc33b3 100644
--- a/lib/classes/databox/subdefsStructure.php
+++ b/lib/classes/databox/subdefsStructure.php
@@ -79,7 +79,7 @@ class databox_subdefsStructure implements IteratorAggregate, Countable
     {
         $sx_struct = $this->databox->get_sxml_structure();
 
-        $this->AvSubdefs = [
+        $avSubdefs = [
             'image' => [],
             'video' => [],
             'audio' => [],
@@ -96,13 +96,14 @@ class databox_subdefsStructure implements IteratorAggregate, Countable
         foreach ($subdefgroup as $k => $subdefs) {
             $subdefgroup_name = strtolower($subdefs->attributes()->name);
 
-            if ( ! isset($AvSubdefs[$subdefgroup_name])) {
-                $AvSubdefs[$subdefgroup_name] = [];
+            if ( ! isset($avSubdefs[$subdefgroup_name])) {
+                $avSubdefs[$subdefgroup_name] = [];
             }
 
             foreach ($subdefs as $sd) {
                 $subdef_name = strtolower($sd->attributes()->name);
 
+                $type = null;
                 switch ($subdefgroup_name) {
                     case 'audio':
                         $type = new \Alchemy\Phrasea\Media\Type\Audio();
@@ -121,13 +122,12 @@ class databox_subdefsStructure implements IteratorAggregate, Countable
                         break;
                     default:
                         continue;
-                        break;
                 }
 
-                $AvSubdefs[$subdefgroup_name][$subdef_name] = new databox_subdef($type, $sd, $this->translator);
+                $avSubdefs[$subdefgroup_name][$subdef_name] = new databox_subdef($type, $sd, $this->translator);
             }
         }
-        $this->AvSubdefs = $AvSubdefs;
+        $this->AvSubdefs = $avSubdefs;
 
         return $this;
     }
diff --git a/lib/classes/media/subdef.php b/lib/classes/media/subdef.php
index cab13bfe10..7264be71ae 100644
--- a/lib/classes/media/subdef.php
+++ b/lib/classes/media/subdef.php
@@ -160,6 +160,9 @@ class media_subdef extends media_abstract implements cache_cacheableInterface
     {
         try {
             $datas = $this->get_data_from_cache();
+            if (!is_array($datas)) {
+                throw new \Exception('Could not retrieve data');
+            }
             $this->mime = $datas['mime'];
             $this->width = $datas['width'];
             $this->height = $datas['height'];
diff --git a/lib/classes/phrasea.php b/lib/classes/phrasea.php
index 7384c259d1..db8e07dbc5 100644
--- a/lib/classes/phrasea.php
+++ b/lib/classes/phrasea.php
@@ -46,9 +46,12 @@ class phrasea
         }
 
         try {
-            self::$_sbas_params = $app['phraseanet.appbox']->get_data_from_cache(self::CACHE_SBAS_PARAMS);
+            $params = $app['phraseanet.appbox']->get_data_from_cache(self::CACHE_SBAS_PARAMS);
+            if (is_array($params)) {
+                self::$_sbas_params = $params;
 
-            return self::$_sbas_params;
+                return $params;
+            }
         } catch (\Exception $e) {
 
         }
diff --git a/lib/classes/record/adapter.php b/lib/classes/record/adapter.php
index d1c17baa27..d3c4f6bb52 100644
--- a/lib/classes/record/adapter.php
+++ b/lib/classes/record/adapter.php
@@ -93,6 +93,10 @@ class record_adapter implements RecordInterface, cache_cacheableInterface
         try {
             $datas = $this->get_data_from_cache();
 
+            if (!is_array($datas)) {
+                throw new Exception('Could not retrieve record data');
+            }
+
             $this->mime = $datas['mime'];
             $this->sha256 = $datas['sha256'];
             $this->original_name = $datas['original_name'];
@@ -105,7 +109,6 @@ class record_adapter implements RecordInterface, cache_cacheableInterface
 
             return $this;
         } catch (\Exception $e) {
-
         }
 
         $connbas = $this->databox->get_connection();
@@ -586,7 +589,10 @@ class record_adapter implements RecordInterface, cache_cacheableInterface
     protected function get_available_subdefs()
     {
         try {
-            return $this->get_data_from_cache(self::CACHE_SUBDEFS);
+            $data = $this->get_data_from_cache(self::CACHE_SUBDEFS);
+            if (is_array($data)) {
+                return $data;
+            }
         } catch (\Exception $e) {
 
         }