diff --git a/src/app/notifications/qa/events/quality-assurance-events.component.html b/src/app/notifications/qa/events/quality-assurance-events.component.html
index d87ff1b353..59075996a1 100644
--- a/src/app/notifications/qa/events/quality-assurance-events.component.html
+++ b/src/app/notifications/qa/events/quality-assurance-events.component.html
@@ -17,23 +17,23 @@
 
       <ds-loading class="container" *ngIf="(isEventPageLoading | async)" message="{{'quality-assurance.loading' | translate}}"></ds-loading>
 
-      <ds-pagination *ngIf="!(isEventPageLoading | async)"
+      <ds-pagination *ngIf="(isEventPageLoading | async) === false"
                       [paginationOptions]="paginationConfig"
                       [collectionSize]="(totalElements$ | async)"
                       [sortOptions]="paginationSortConfig"
                       (paginationChange)="getQualityAssuranceEvents()">
 
         <ng-container>
-          <div *ngIf="(eventsUpdated$|async)?.length == 0" class="alert alert-info w-100 mb-2 mt-2" role="alert">
+          <div *ngIf="(eventsUpdated$ | async)?.length === 0" class="alert alert-info w-100 mb-2 mt-2" role="alert">
             {{'quality-assurance.noEvents' | translate}}
           </div>
-          <div *ngIf="(eventsUpdated$|async)?.length != 0" class="table-responsive mt-2">
+          <div *ngIf="(eventsUpdated$ | async)?.length !== 0" class="table-responsive mt-2">
             <table id="events" class="table table-striped table-hover table-bordered">
               <thead>
               <tr>
                 <th scope="col" class="trust-col">{{'quality-assurance.event.table.trust' | translate}}</th>
                 <th scope="col" class="title-col">{{'quality-assurance.event.table.publication' | translate}}</th>
-                <th *ngIf="hasDetailColumn() && showTopic.indexOf('/PROJECT') == -1" scope="col" class="content-col">
+                <th *ngIf="hasDetailColumn() && showTopic.indexOf('/PROJECT') === -1" scope="col" class="content-col">
                   {{'quality-assurance.event.table.details' | translate}}
                 </th>
                 <th *ngIf="hasDetailColumn() && showTopic.indexOf('/PROJECT') !== -1" scope="col" class="content-col">
@@ -126,7 +126,7 @@
                       >
                         <i class="fas fa-check"></i>
                       </button>
-                      <button *ngIf="showTopic.indexOf('/PROJECT') == -1"
+                      <button *ngIf="showTopic.indexOf('/PROJECT') === -1"
                               class="btn btn-outline-success btn-sm button-width"
                               ngbTooltip="{{'quality-assurance.event.action.accept' | translate}}"
                               container="body"
diff --git a/src/app/notifications/qa/project-entry-import-modal/project-entry-import-modal.component.html b/src/app/notifications/qa/project-entry-import-modal/project-entry-import-modal.component.html
index 0622e08ab0..bbaef85687 100644
--- a/src/app/notifications/qa/project-entry-import-modal/project-entry-import-modal.component.html
+++ b/src/app/notifications/qa/project-entry-import-modal/project-entry-import-modal.component.html
@@ -38,7 +38,7 @@
     </div>
 
     <ds-loading *ngIf="(isLoading$ | async)" message="{{'loading.search-results' | translate}}"></ds-loading>
-    <ds-themed-search-results *ngIf="(localEntitiesRD$ | async)?.payload?.page?.length > 0 && !(isLoading$ | async)"
+    <ds-themed-search-results *ngIf="(localEntitiesRD$ | async)?.payload?.page?.length > 0 && (isLoading$ | async) === false"
                               [searchResults]="(localEntitiesRD$ | async)"
                               [sortConfig]="this.searchOptions?.sort"
                               [searchConfig]="this.searchOptions"
@@ -53,7 +53,7 @@
                               (selectObject)="selectEntity($event)">
     </ds-themed-search-results>
 
-    <div *ngIf="(localEntitiesRD$ | async)?.payload?.page?.length < 1 && !(isLoading$ | async)">
+    <div *ngIf="(localEntitiesRD$ | async)?.payload?.page?.length < 1 && (isLoading$ | async) === false">
       <ds-alert [type]="'alert-info'">
         <p class="lead mb-0">{{(labelPrefix + label + '.notFound' | translate)}}</p>
       </ds-alert>
diff --git a/src/app/notifications/qa/source/quality-assurance-source.component.html b/src/app/notifications/qa/source/quality-assurance-source.component.html
index 0f6cf18402..61789f838b 100644
--- a/src/app/notifications/qa/source/quality-assurance-source.component.html
+++ b/src/app/notifications/qa/source/quality-assurance-source.component.html
@@ -10,7 +10,7 @@
         <h4 class="border-bottom pb-2">{{'quality-assurance.source'| translate}}</h4>
 
         <ds-loading class="container" *ngIf="(isSourceLoading() | async)" message="{{'quality-assurance.loading' | translate}}"></ds-loading>
-        <ds-pagination *ngIf="!(isSourceLoading() | async)"
+        <ds-pagination *ngIf="(isSourceLoading() | async) === false"
                        [paginationOptions]="paginationConfig"
                        [collectionSize]="(totalElements$ | async)"
                        [hideGear]="false"
@@ -18,11 +18,11 @@
                        (paginationChange)="getQualityAssuranceSource()">
 
           <ds-loading class="container" *ngIf="(isSourceProcessing() | async)" message="'quality-assurance.loading' | translate"></ds-loading>
-          <ng-container *ngIf="!(isSourceProcessing() | async)">
-            <div *ngIf="(sources$|async)?.length == 0" class="alert alert-info w-100 mb-2 mt-2" role="alert">
+          <ng-container *ngIf="(isSourceProcessing() | async) === false">
+            <div *ngIf="(sources$ | async)?.length === 0" class="alert alert-info w-100 mb-2 mt-2" role="alert">
               {{'quality-assurance.noSource' | translate}}
             </div>
-            <div *ngIf="(sources$|async)?.length != 0" class="table-responsive mt-2">
+            <div *ngIf="(sources$ | async)?.length !== 0" class="table-responsive mt-2">
               <table id="epeople" class="table table-striped table-hover table-bordered">
                 <thead>
                 <tr>
diff --git a/src/app/notifications/qa/source/quality-assurance-source.effects.ts b/src/app/notifications/qa/source/quality-assurance-source.effects.ts
index 7dacef60e7..d866d43365 100644
--- a/src/app/notifications/qa/source/quality-assurance-source.effects.ts
+++ b/src/app/notifications/qa/source/quality-assurance-source.effects.ts
@@ -47,9 +47,11 @@ export class QualityAssuranceSourceEffects {
         map((sources: PaginatedList<QualityAssuranceSourceObject>) =>
           new AddSourceAction(sources.page, sources.totalPages, sources.currentPage, sources.totalElements),
         ),
-        catchError((error: Error) => {
-          if (error) {
+        catchError((error: unknown) => {
+          if (error instanceof Error) {
             console.error(error.message);
+          } else {
+            console.error('Unexpected object thrown', error);
           }
           return observableOf(new RetrieveAllSourceErrorAction());
         }),
diff --git a/src/app/notifications/qa/topics/quality-assurance-topics.component.html b/src/app/notifications/qa/topics/quality-assurance-topics.component.html
index db8586f264..5d2b373442 100644
--- a/src/app/notifications/qa/topics/quality-assurance-topics.component.html
+++ b/src/app/notifications/qa/topics/quality-assurance-topics.component.html
@@ -10,7 +10,7 @@
       <h4 class="border-bottom pb-2">{{'quality-assurance.topics'| translate}}</h4>
 
       <ds-loading class="container" *ngIf="(isTopicsLoading() | async)" message="{{'quality-assurance.loading' | translate}}"></ds-loading>
-      <ds-pagination *ngIf="!(isTopicsLoading() | async)"
+      <ds-pagination *ngIf="(isTopicsLoading() | async) === false"
                      [paginationOptions]="paginationConfig"
                      [collectionSize]="(totalElements$ | async)"
                      [hideGear]="false"
@@ -18,11 +18,11 @@
                      (paginationChange)="getQualityAssuranceTopics()">
 
         <ds-loading class="container" *ngIf="(isTopicsProcessing() | async)" message="'quality-assurance.loading' | translate"></ds-loading>
-        <ng-container *ngIf="!(isTopicsProcessing() | async)">
-          <div *ngIf="(topics$|async)?.length == 0" class="alert alert-info w-100 mb-2 mt-2" role="alert">
+        <ng-container *ngIf="(isTopicsProcessing() | async) === false">
+          <div *ngIf="(topics$ | async)?.length === 0" class="alert alert-info w-100 mb-2 mt-2" role="alert">
             {{'quality-assurance.noTopics' | translate}}
           </div>
-          <div *ngIf="(topics$|async)?.length != 0" class="table-responsive mt-2">
+          <div *ngIf="(topics$ | async)?.length !== 0" class="table-responsive mt-2">
             <table id="epeople" class="table table-striped table-hover table-bordered">
               <thead>
               <tr>
diff --git a/src/app/notifications/qa/topics/quality-assurance-topics.effects.ts b/src/app/notifications/qa/topics/quality-assurance-topics.effects.ts
index e142c2a100..58d5c57460 100644
--- a/src/app/notifications/qa/topics/quality-assurance-topics.effects.ts
+++ b/src/app/notifications/qa/topics/quality-assurance-topics.effects.ts
@@ -47,9 +47,11 @@ export class QualityAssuranceTopicsEffects {
         map((topics: PaginatedList<QualityAssuranceTopicObject>) =>
           new AddTopicsAction(topics.page, topics.totalPages, topics.currentPage, topics.totalElements),
         ),
-        catchError((error: Error) => {
-          if (error) {
+        catchError((error: unknown) => {
+          if (error instanceof Error) {
             console.error(error.message);
+          } else {
+            console.error('Unexpected object thrown', error);
           }
           return observableOf(new RetrieveAllTopicsErrorAction());
         }),