diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 2611060a..f16c7e02 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -875,11 +875,6 @@ parameters:
 			count: 1
 			path: src/lib/Service/ContentService.php
 
-		-
-			message: "#^Method EzSystems\\\\EzRecommendationClient\\\\Service\\\\ContentService\\:\\:prepareFields\\(\\) should return array\\<string\\> but returns array\\<int\\<0, max\\>, mixed\\>\\|null\\.$#"
-			count: 1
-			path: src/lib/Service/ContentService.php
-
 		-
 			message: "#^Method EzSystems\\\\EzRecommendationClient\\\\Service\\\\ContentService\\:\\:setContent\\(\\) return type has no value type specified in iterable type array\\.$#"
 			count: 1
diff --git a/src/lib/Service/ContentService.php b/src/lib/Service/ContentService.php
index b41be9b2..1f2d770c 100644
--- a/src/lib/Service/ContentService.php
+++ b/src/lib/Service/ContentService.php
@@ -265,6 +265,7 @@ private function prepareFields(APIContentType $contentType, ?array $fields = nul
             return $fields;
         }
 
+        $fields = [];
         foreach ($contentType->getFieldDefinitions() as $field) {
             $fields[] = $field->identifier;
         }