Merge "Check activity != null before accessing it" into main am: 4d43739814

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3556045

Change-Id: I46f042dfacb91899cb3970b7484e4d8bf90d89c8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/TerminalTabFragment.kt b/android/TerminalApp/java/com/android/virtualization/terminal/TerminalTabFragment.kt
index 72dea5c..8106f6e 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/TerminalTabFragment.kt
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/TerminalTabFragment.kt
@@ -216,7 +216,7 @@
     }
 
     private fun updateMainActivity() {
-        val mainActivity = (activity as MainActivity)
+        val mainActivity = activity as MainActivity ?: return
         if (terminalGuiSupport()) {
             mainActivity.displayMenu!!.visibility = View.VISIBLE
             mainActivity.displayMenu!!.isEnabled = true