diff --git a/app/src/main/java/com/emanuelef/remote_capture/activities/MainActivity.java b/app/src/main/java/com/emanuelef/remote_capture/activities/MainActivity.java
index 78ed9baf..fb426082 100644
--- a/app/src/main/java/com/emanuelef/remote_capture/activities/MainActivity.java
+++ b/app/src/main/java/com/emanuelef/remote_capture/activities/MainActivity.java
@@ -737,7 +737,7 @@ public class MainActivity extends BaseActivity implements NavigationView.OnNavig
     }
 
     private void sslkeyfileExportResult(final ActivityResult result) {
-        if(result.getResultCode() == RESULT_OK && result.getData() != null) {
+        if((result.getResultCode() == RESULT_OK) && (result.getData() != null) && (mKeylogFile != null)) {
             try(OutputStream out = getContentResolver().openOutputStream(result.getData().getData(), "rwt")) {
                 Utils.copy(mKeylogFile, out);
                 Utils.showToast(this, R.string.save_ok);
diff --git a/submodules/zdtun b/submodules/zdtun
index 554ac043..611c5460 160000
--- a/submodules/zdtun
+++ b/submodules/zdtun
@@ -1 +1 @@
-Subproject commit 554ac043f44af1c31869dd0d453cbb74e5ba739e
+Subproject commit 611c5460a6371eedfb6b6739fb9e0b2f058e0947