Stop decodeParams utility from trying to recursively decode strings as an array. (#536)

Author: mkhamash

src/Utility/JsonHelper.php

@@ -20,11 +20,11 @@ public static function decodeParams(array $values = []) {
       }
 
       if (($decoded = json_decode($value, TRUE)) !== NULL && $decoded != $value) {
-        return static::decodeParams($decoded);
+        return is_array($decoded) ? static::decodeParams($decoded) : $decoded;
       }
 
       return $value;
     }, $values);
   }
 
-}
+}