Fixed response data method

diff --git a/wcfsetup/install/files/js/WCF.js b/wcfsetup/install/files/js/WCF.js
index be9614fb1366f171e3fc7f4c5771b034d84e4e66..576d4648c42a5a7c11242cd556776d52d6624c50 100644 (file)
--- a/wcfsetup/install/files/js/WCF.js
+++ b/wcfsetup/install/files/js/WCF.js
@@ -3356,7 +3356,7 @@ $.widget('ui.wcfAJAXDialog', $.ui.dialog, {
                }
 
                // AJAXProxy
-               if ($data.returnValues[key]) {
+               if ($data.returnValues && $data.returnValues[key]) {
                        return $data.returnValues[key];
                }
                // PackageInstallation