1 files changed, 5 insertions, 3 deletions
diff --git a/web/app/Application.js b/web/app/Application.js
index 83ca9e860..ebf685dbc 100644
--- a/web/app/Application.js
+++ b/web/app/Application.js
@@ -86,14 +86,16 @@ Ext.define('Traccar.Application', {
                 if (!result.success) {
                     Ext.Msg.alert(Strings.errorTitle, result.error);
                 }
-                handler.call(scope, options, success, response);
+                if (handler) {
+                    handler.call(scope, options, success, response);
+                }
             } else {
                 if (response.statusText) {
                     Ext.Msg.alert(Strings.errorTitle, response.statusText);
                 } else {
-                    Ext.Msg.alert(Strings.errorTitle, response.status.toString()); // TODO: text message
+                    Ext.Msg.alert(Strings.errorTitle, Strings.errorConnection);
                 }
             }
-        }
+        };
     }
 });