Update SetList.php

Author: Amadeco

Block/SetList.php

@@ -319,16 +319,21 @@ public function getIdentities(): array
     {
         $identities = [];
 
-        $set = $this->getLayer()->getCurrentAttributeSet();
-        if ($set) {
-            $identities[] = CustomEntity::CACHE_CUSTOM_ENTITY_SET_TAG . '_' . $set->getAttributeSetId();
+        $attributeSet = $this->getLayer()->getCurrentAttributeSet();
+        if ($attributeSet) {
+            $identities[] = CustomEntity::CACHE_CUSTOM_ENTITY_SET_TAG . '_' . $attributeSet->getAttributeSetId();
         }
 
         foreach ($this->_getEntityCollection() as $entity) {
-            $identities[] = $entity->getIdentities();
+            $entityIdentities = $entity->getIdentities();
+            if ($entityIdentities) {
+                foreach ($entityIdentities as $identity) {
+                    $identities[] = $identity;
+                }
+            }
         }
 
-        return $identities;
+        return array_unique($identities);
     }
 
     /**