Small fix

lib/main.dart

@@ -91,7 +91,7 @@ class MyFormState extends State<MyForm> {
 
   Future _cancelTimer() async {
     await _updateLokinetStatus();
-    _timer.cancel();
+    if (_timer != null) _timer.cancel();
   }
 
   Future toogleLokinet() async {

lib/src/utils/is_dakmode.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 
 bool inDarkMode(BuildContext context) {
-  // return false;
   var brightness = MediaQuery.of(context).platformBrightness;
   return brightness == Brightness.dark;
 }