Returning false if there is a json error in user search

@@ -179,7 +179,11 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
         }
         }
 
 
         list($user_id, $user_string) = mysql_fetch_row($this->result);
         list($user_id, $user_string) = mysql_fetch_row($this->result);
-        $data = array_merge(array_map(function() { return ''; }, array_flip($this->fields)), json_decode($user_string, true));
+        $json_data = json_decode($user_string, true);
+        if (json_last_error() != JSON_ERROR_NONE) {
+            return false;
+        }
+        $data = array_merge(array_map(function() { return ''; }, array_flip($this->fields)), $json_data);
         foreach ($data as $key => &$val) {
         foreach ($data as $key => &$val) {
             $val = maybe_unserialize($val);
             $val = maybe_unserialize($val);
         }
         }