2nd attempt to fix double unregistering receivers

mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt

@@ -401,7 +401,7 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
     }
     private fun cleanLocked() {
         if (receiverRegistered) {
-            unregisterReceiver(receiver)
+            ensureReceiverUnregistered(receiver)
             receiverRegistered = false
         }
         if (Build.VERSION.SDK_INT >= 28) {

mobile/src/main/java/be/mygod/vpnhotspot/TetheringService.kt

@@ -10,6 +10,7 @@ import be.mygod.vpnhotspot.net.TetheringManager.tetheredIfaces
 import be.mygod.vpnhotspot.net.monitor.IpNeighbourMonitor
 import be.mygod.vpnhotspot.util.Event0
 import be.mygod.vpnhotspot.util.broadcastReceiver
+import be.mygod.vpnhotspot.util.ensureReceiverUnregistered
 import kotlinx.coroutines.*
 import java.util.concurrent.ConcurrentHashMap
 
@@ -117,7 +118,7 @@ class TetheringService : IpNeighbourMonitoringService(), CoroutineScope {
 
     private fun unregisterReceiver() {
         if (receiverRegistered) {
-            unregisterReceiver(receiver)
+            ensureReceiverUnregistered(receiver)
             IpNeighbourMonitor.unregisterCallback(this)
             receiverRegistered = false
         }

mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt

@@ -35,6 +35,12 @@ fun Long.toPluralInt(): Int {
     return (this % 1000000000).toInt() + 1000000000
 }
 
+fun Context.ensureReceiverUnregistered(receiver: BroadcastReceiver) {
+    try {
+        unregisterReceiver(receiver)
+    } catch (_: IllegalArgumentException) { }
+}
+
 @SuppressLint("Recycle")
 fun <T> useParcel(block: (Parcel) -> T) = Parcel.obtain().run {
     try {