Add check if the response is array

Author: glo24157

lib/internal/Magento/Framework/Cache/Backend/Redis.php

@@ -52,7 +52,7 @@ public function load($id, $doNotTestCacheValidity = false)
             }
 
             $redisResponse = $redis->exec();
-            $this->preloadedData = $redisResponse ?
+            $this->preloadedData = is_array($redisResponse) ?
                 array_filter(array_combine($this->preloadKeys, $redisResponse)) :
                 [];
         }