diff --git a/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php b/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
index ffc872ec95..c39271db6a 100644
--- a/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
+++ b/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
@@ -88,7 +88,7 @@ class PhraseanetExtension extends \Twig_Extension
             $highlightValue = $highlights[$field];
 
             // if field is multivalued, merge highlighted values with captions ones
-            if (is_array($value)) {
+            if (is_array($value) && count($value) > 1) {
                 $highlightValue = array_merge($highlightValue, array_diff($value, array_map(function($value) {
                     return str_replace(array('[[em]]', '[[/em]]'), array('', ''), $value);
                 }, $highlightValue)));