diff --git a/services/core/java/com/android/server/wm/RunningTasks.java b/services/core/java/com/android/server/wm/RunningTasks.java
index d31b007c56afd..3d6d1825adc7d 100644
--- a/services/core/java/com/android/server/wm/RunningTasks.java
+++ b/services/core/java/com/android/server/wm/RunningTasks.java
@@ -82,7 +82,8 @@ class RunningTasks {
         mRecentTasks = root.mService.getRecentTasks();
         mKeepIntentExtra = (flags & FLAG_KEEP_INTENT_EXTRA) == FLAG_KEEP_INTENT_EXTRA;
 
-        if (mTopDisplayFocusRootTask.getAdjacentTaskFragment() != null) {
+        if (mTopDisplayFocusRootTask != null
+                && mTopDisplayFocusRootTask.getAdjacentTaskFragment() != null) {
             mTopDisplayAdjacentTask = mTopDisplayFocusRootTask.getAdjacentTaskFragment().asTask();
         } else {
             mTopDisplayAdjacentTask = null;