diff --git a/InvenTree/templates/js/forms.js b/InvenTree/templates/js/forms.js
index cb505c2a11..68eda4b734 100644
--- a/InvenTree/templates/js/forms.js
+++ b/InvenTree/templates/js/forms.js
@@ -532,10 +532,49 @@ function submitFormData(fields, options) {
             error: function(xhr, status, thrownError) {
                 
                 switch (xhr.status) {
-                    case 400:  // Bad request
+                    case 400:   // Bad request
                         handleFormErrors(xhr.responseJSON, fields, options);
                         break;
+                    case 0:     // No response
+                        $(options.modal).modal('hide');
+                        showAlertDialog(
+                            '{% trans "No Response" %}',
+                            '{% trans "No response from the InvenTree server" %}',
+                        );
+                        break;
+                    case 401:   // Not authenticated
+                        $(options.modal).modal('hide');
+                        showAlertDialog(
+                            '{% trans "Error 401: Not Authenticated" %}',
+                            '{% trans "Authentication credentials not supplied" %}',
+                        );
+                        break;
+                    case 403:   // Permission denied
+                        $(options.modal).modal('hide');
+                        showAlertDialog(
+                            '{% trans "Error 403: Permission Denied" %}',
+                            '{% trans "You do not have the required permissions to access this function" %}',
+                        );
+                        break;
+                    case 404:   // Resource not found
+                        $(options.modal).modal('hide');  
+                        showAlertDialog(
+                            '{% trans "Error 404: Resource Not Found" %}',
+                            '{% trans "The requested resource could not be located on the server" %}',
+                        );
+                        break;
+                    case 408:   // Timeout
+                        $(options.modal).modal('hide');  
+                        showAlertDialog(
+                            '{% trans "Error 408: Timeout" %}',
+                            '{% trans "Connection timeout while requesting data from server" %}',
+                        );
+                        break;
                     default:
+                        $(options.modal).modal('hide');
+
+                        showAlertDialog('{% trans "Error requesting form data" %}', renderErrorMessage(xhr));
+
                         console.log(`WARNING: Unhandled response code - ${xhr.status}`);
                         break;
                 }