Local notification on Android causes crash

[mogurito]

Hi we released our game yesterday and received some crash logs on Google console.

`Samsung Galaxy S9 (starlte), Android 8.0
Report 1

java.lang.RuntimeException:
at android.app.ActivityThread.handleReceiver (ActivityThread.java:3397)
at android.app.ActivityThread.-wrap18 (Unknown Source)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1780)
at android.os.Handler.dispatchMessage (Handler.java:105)
at android.os.Looper.loop (Looper.java:164)
at android.app.ActivityThread.main (ActivityThread.java:6938)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException:
at net.agasper.unitynotification.UnityNotificationManager.onReceive (UnityNotificationManager.java:153)
at android.app.ActivityThread.handleReceiver (ActivityThread.java:3390)`

We used the notification.jar that is inside the UnityProject example commited May 21.

[siadark]

looks like we have the same stack of crash on android 8.0 and 7.0 with the latest plugin

java.lang.Error: FATAL EXCEPTION [main]
Unity version : 5.6.6f2
Device model : HUAWEI BAH-L09
Device fingerprint: HUAWEI/BAH/HWBAH-Q:7.0/HUAWEIBAH-L09/C170B271:user/release-keys
Caused by
at android.app.ActivityThread.handleReceiver (ActivityThread.java:3202)
at android.app.ActivityThread.-wrap18 (ActivityThread.java)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1664)
at android.os.Handler.dispatchMessage (Handler.java:105)
at android.os.Looper.loop (Looper.java:156)
at android.app.ActivityThread.main (ActivityThread.java:6623)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:832)
Caused by: java.lang.IllegalArgumentException:
at android.app.NotificationManager.notifyAsUser (NotificationManager.java:318)
at android.app.NotificationManager.notify (NotificationManager.java:293)
at android.app.NotificationManager.notify (NotificationManager.java:277)
at net.agasper.unitynotification.UnityNotificationManager.onReceive (UnityNotificationManager.java:219)
at android.app.ActivityThread.handleReceiver (ActivityThread.java:3192)