diff --git a/lib/pages/host_scan_page/host_scan_bloc/host_scan_bloc.dart b/lib/pages/host_scan_page/host_scan_bloc/host_scan_bloc.dart
index 2fe3adc..1334a74 100644
--- a/lib/pages/host_scan_page/host_scan_bloc/host_scan_bloc.dart
+++ b/lib/pages/host_scan_page/host_scan_bloc/host_scan_bloc.dart
@@ -79,9 +79,13 @@ class HostScanBloc extends Bloc<HostScanEvent, HostScanState> {
     }
     if (gatewayIp == null) {
       emit(const HostScanState.error());
-      return;
+      return Future.error('Can not get wifi details');
     }
     subnet = gatewayIp!.substring(0, gatewayIp!.lastIndexOf('.'));
+    if (subnet == null) {
+      emit(const HostScanState.error());
+      return Future.error('Can not get wifi details');
+    }
     if (appSettings.runScanOnStartup) {
       add(const HostScanEvent.loadScan());
     } else {