diff --git a/app/src/main/java/org/fptn/vpn/services/vpn/FptnConnection.java b/app/src/main/java/org/fptn/vpn/services/vpn/FptnConnection.java
index e7c86319..17597c66 100644
--- a/app/src/main/java/org/fptn/vpn/services/vpn/FptnConnection.java
+++ b/app/src/main/java/org/fptn/vpn/services/vpn/FptnConnection.java
@@ -360,7 +360,9 @@ private void sendConnectionStateToService(ConnectionState connectionState) {
     }
 
     private boolean isTunInterfaceValid(ParcelFileDescriptor vpnInterface) {
-        return vpnInterface.getFileDescriptor() != null;
+        return vpnInterface != null 
+            && vpnInterface.getFileDescriptor() != null 
+            && vpnInterface.getFileDescriptor().valid();
     }
 
     private String getTag() {