diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/DefaultNetworkMonitor.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/DefaultNetworkMonitor.kt
index 0cfb4035..b2803315 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/DefaultNetworkMonitor.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/DefaultNetworkMonitor.kt
@@ -41,7 +41,11 @@ object DefaultNetworkMonitor : UpstreamMonitor() {
             if (currentNetwork != network) return
             val oldProperties = currentLinkProperties!!
             currentLinkProperties = properties
-            val ifname = properties.interfaceName!!
+            val ifname = properties.interfaceName
+            if (ifname == null) {
+                onLost(network)
+                return
+            }
             check(ifname == oldProperties.interfaceName)
             if (properties.dnsServers != oldProperties.dnsServers)
                 callbacks.forEach { it.onAvailable(ifname, properties.dnsServers) }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/VpnMonitor.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/VpnMonitor.kt
index e7f24b41..8f459e45 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/VpnMonitor.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/VpnMonitor.kt
@@ -44,7 +44,11 @@ object VpnMonitor : UpstreamMonitor() {
             synchronized(this@VpnMonitor) {
                 if (currentNetwork != network) return
                 val oldProperties = available.put(network, properties)!!
-                val ifname = properties.interfaceName!!
+                val ifname = properties.interfaceName
+                if (ifname == null) {
+                    onLost(network)
+                    return
+                }
                 check(ifname == oldProperties.interfaceName)
                 if (properties.dnsServers != oldProperties.dnsServers)
                     callbacks.forEach { it.onAvailable(ifname, properties.dnsServers) }