fixed #375

Author: tux-mind

cSploit/src/org/csploit/android/services/NetworkRadar.java

@@ -61,7 +61,7 @@ public void run() {
   @Override
   public void buildMenuItem(MenuItem item) {
     item.setTitle(isRunning() ? R.string.stop_monitor : R.string.start_monitor);
-    item.setEnabled(System.getTools().networkRadar.isEnabled());
+    item.setEnabled(System.getTools().networkRadar.isEnabled() && System.getNetwork() != null);
   }
 
   private class Receiver extends org.csploit.android.tools.NetworkRadar.HostReceiver {

cSploit/src/org/csploit/android/tools/NetworkRadar.java

@@ -56,6 +56,10 @@ public void onEvent(Event e) {
   public Child start(HostReceiver receiver) throws ChildManager.ChildNotStartedException {
     String ifName;
 
+    if(System.getNetwork() == null) {
+      throw new ChildManager.ChildNotStartedException();
+    }
+
     ifName = System.getNetwork().getInterface().getDisplayName();
 
     return async(ifName, receiver);