diff --git a/src/Symfony/Component/Cache/Traits/RedisTrait.php b/src/Symfony/Component/Cache/Traits/RedisTrait.php
index 395a9b8051b4..c4b12b64bb37 100644
--- a/src/Symfony/Component/Cache/Traits/RedisTrait.php
+++ b/src/Symfony/Component/Cache/Traits/RedisTrait.php
@@ -179,7 +179,13 @@ protected function doFetch(array $ids)
                 }
             });
         } else {
-            $values = array_combine($ids, $this->redis->mget($ids));
+            $values = $this->redis->mget($ids);
+
+            if (!\is_array($values) || \count($values) !== \count($ids)) {
+                return [];
+            }
+
+            $values = array_combine($ids, $values);
         }
 
         foreach ($values as $id => $v) {