diff --git a/services/java/com/android/server/am/ActivityStack.java b/services/java/com/android/server/am/ActivityStack.java
index 0f1700dce5c62..c344023070a09 100644
--- a/services/java/com/android/server/am/ActivityStack.java
+++ b/services/java/com/android/server/am/ActivityStack.java
@@ -3655,7 +3655,9 @@ final class ActivityStack {
         }
 
         if (activityRemoved) {
-            resumeTopActivityLocked(null);
+            synchronized (mService) {
+                resumeTopActivityLocked(null);
+            }
         }
 
         return res;