Add NPE check around live data

Fixes: 385386678
Test: manual
Flag: EXEMPT bugfix
Change-Id: I85d868fb0d6588af16355e2fe097161699c39123

1 files changed, 1 insertions, 1 deletions

diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardSliceViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardSliceViewController.java
index 42460617d476..a8de43332556 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardSliceViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardSliceViewController.java
@@ -140,7 +140,7 @@ public class KeyguardSliceViewController extends ViewController<KeyguardSliceVie
     @Override
     protected void onViewDetached() {
         // TODO(b/117344873) Remove below work around after this issue be fixed.
-        if (mDisplayId == mDisplayTracker.getDefaultDisplayId()) {
+        if (mDisplayId == mDisplayTracker.getDefaultDisplayId() && mLiveData != null) {
             mLiveData.removeObserver(mObserver);
         }
         mConfigurationController.removeCallback(mConfigurationListener);