java.lang.RuntimeException: Error receiving broadcast Intent { act=com.example.r_upgrade.RECEIVER_CANCEL

[summeryi]

Version:0.3.8+2
小米手机，具体操作：打开WIFi 和 流量下载 - > 触发下载 -> 关闭WiFi,自动切换到流量下载 ->打开WIFi -> 关闭流量下载 重复以上操作会几率触发

E/AndroidRuntime(32134): FATAL EXCEPTION: main
E/AndroidRuntime(32134): Process: com.aifitness.gymbot.phone, PID: 32134
E/AndroidRuntime(32134): java.lang.RuntimeException: Error receiving broadcast Intent { act=com.example.r_upgrade.RECEIVER_CANCEL flg=0x10 (has extras) } in com.example.r_upgrade.common.UpgradeService$1@f86b8cb
E/AndroidRuntime(32134): at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1708)
E/AndroidRuntime(32134): at android.app.LoadedApk$ReceiverDispatcher$Args$$ExternalSyntheticLambda0.run(Unknown Source:2)
E/AndroidRuntime(32134): at android.os.Handler.handleCallback(Handler.java:938)
E/AndroidRuntime(32134): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(32134): at android.os.Looper.loopOnce(Looper.java:210)
E/AndroidRuntime(32134): at android.os.Looper.loop(Looper.java:299)
E/AndroidRuntime(32134): at android.app.ActivityThread.main(ActivityThread.java:8227)
E/AndroidRuntime(32134): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(32134): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
E/AndroidRuntime(32134): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1045)
E/AndroidRuntime(32134): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.Timer.cancel()' on a null object reference
E/AndroidRuntime(32134): at com.example.r_upgrade.common.UpgradeService$UpgradeRunnable.cancel(UpgradeService.java:235)
E/AndroidRuntime(32134): at com.example.r_upgrade.common.UpgradeService$UpgradeRunnable.access$100(UpgradeService.java:200)
E/AndroidRuntime(32134): at com.example.r_upgrade.common.UpgradeService$1.onReceive(UpgradeService.java:79)
E/AndroidRuntime(32134): at android.app.LoadedApk$ReceiverDispatcher$Args.lambda$getRunnable$0$LoadedApk$ReceiverDispatcher$Args(LoadedApk.java:1694)
E/AndroidRuntime(32134): ... 9 more