#399

frontend/src/pages/users/SettingPage.tsx

@@ -1197,13 +1197,9 @@ const SettingPage: FC<Props> = ({ user, setUser }) => {
   }, [hasUnsavedThemeChanges, savedThemeSlots])
 
   useEffect (() => {
-    registerUnsavedChangesSource ({
-	dirty: hasPageUnsavedChanges,
-	discard: discardAllDirtyChanges })
-
-    return () => {
-      registerUnsavedChangesSource (null)
-    }
+    return registerUnsavedChangesSource ({
+        dirty: hasPageUnsavedChanges,
+        discard: discardAllDirtyChanges })
   }, [discardAllDirtyChanges, hasPageUnsavedChanges, registerUnsavedChangesSource])
 
   useKeyboardShortcuts ({