Add safety check about cache value (#6283)

Author: VincentLanglet

src/Connection.php

@@ -37,6 +37,7 @@
 use function count;
 use function get_class;
 use function implode;
+use function is_array;
 use function is_int;
 use function is_string;
 use function key;
@@ -1137,6 +1138,10 @@ public function executeCacheQuery($sql, $params, $types, QueryCacheProfile $qcp)
 
         if ($item->isHit()) {
             $value = $item->get();
+            if (! is_array($value)) {
+                $value = [];
+            }
+
             if (isset($value[$realKey])) {
                 return new Result(new ArrayResult($value[$realKey]), $this);
             }