From b5d65168fb289bd2d43e3d31f6422adb040a68dc Mon Sep 17 00:00:00 2001
From: Enbiya Olgun <78034913+NBA2K1@users.noreply.github.com>
Date: Tue, 22 Apr 2025 00:39:00 +0200
Subject: [PATCH] Fix Exception

```
[ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: Bad state: Cannot use "ref" after the widget was disposed.
#0      ConsumerStatefulElement._assertNotDisposed (package:flutter_riverpod/src/consumer.dart:550:7)
consumer.dart:550
#1      ConsumerStatefulElement.read (package:flutter_riverpod/src/consumer.dart:619:5)
consumer.dart:619
#2      _MainScreenState.initState.<anonymous closure>.<anonymous closure> (package:mangayomi/modules/main_view/main_screen.dart:70:13)
main_screen.dart:70
#3      _Timer._runTimers (dart:isolate-patch/timer_impl.dart:410:19)
timer_impl.dart:410
#4      _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:441:5)
timer_impl.dart:441
#5      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:194:12)
isolate_patch.dart:194
```
---
 lib/modules/main_view/main_screen.dart | 59 ++++++++++++++++++--------
 1 file changed, 42 insertions(+), 17 deletions(-)

diff --git a/lib/modules/main_view/main_screen.dart b/lib/modules/main_view/main_screen.dart
index b64cf99a..d63a2c5e 100644
--- a/lib/modules/main_view/main_screen.dart
+++ b/lib/modules/main_view/main_screen.dart
@@ -38,6 +38,8 @@ class MainScreen extends ConsumerStatefulWidget {
 }
 
 class _MainScreenState extends ConsumerState<MainScreen> {
+  Timer? _backupTimer;
+  Timer? _syncTimer;
   String getHyphenatedUpdatesLabel(String languageCode, String defaultLabel) {
     switch (languageCode) {
       case 'de':
@@ -63,26 +65,19 @@ class _MainScreenState extends ConsumerState<MainScreen> {
   late String defaultLocation = navigationOrder.first;
   @override
   initState() {
+    super.initState();
     WidgetsBinding.instance.addPostFrameCallback((_) {
       context.go(defaultLocation);
 
-      Timer.periodic(Duration(minutes: 5), (timer) {
-        ref.read(checkAndBackupProvider);
-      });
+      _backupTimer = Timer.periodic(
+        const Duration(minutes: 5),
+        _onBackupTimerTick,
+      );
       if (autoSyncFrequency != 0) {
-        final l10n = l10nLocalizations(context)!;
-        Timer.periodic(Duration(seconds: autoSyncFrequency), (timer) {
-          try {
-            ref
-                .read(syncServerProvider(syncId: 1).notifier)
-                .startSync(l10n, true);
-          } catch (e) {
-            botToast(
-              "Failed to sync! Maybe the sync server is down. Restart the app to resume auto sync.",
-            );
-            timer.cancel();
-          }
-        });
+        _syncTimer = Timer.periodic(
+          Duration(seconds: autoSyncFrequency),
+          _onSyncTimerTick,
+        );
       }
 
       ref.watch(checkForUpdateProvider(context: context));
@@ -90,8 +85,38 @@ class _MainScreenState extends ConsumerState<MainScreen> {
       ref.watch(fetchAnimeSourcesListProvider(id: null, reFresh: false));
       ref.watch(fetchNovelSourcesListProvider(id: null, reFresh: false));
     });
+  }
 
-    super.initState();
+  void _onBackupTimerTick(Timer timer) {
+    if (!mounted) {
+      timer.cancel();
+      return;
+    }
+    ref.read(checkAndBackupProvider);
+  }
+
+  void _onSyncTimerTick(Timer timer) {
+    if (!mounted) {
+      timer.cancel();
+      return;
+    }
+    try {
+      final l10n = l10nLocalizations(context)!;
+      ref.read(syncServerProvider(syncId: 1).notifier).startSync(l10n, true);
+    } catch (e) {
+      botToast(
+        "Failed to sync! Maybe the sync server is down. "
+        "Restart the app to resume auto sync.",
+      );
+      timer.cancel();
+    }
+  }
+
+  @override
+  void dispose() {
+    _backupTimer?.cancel();
+    _syncTimer?.cancel();
+    super.dispose();
   }
 
   @override