diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index fcfd5491d22fa4740bdec11286e9addb21634340..1ee034797d6c274587d91dc42b39299bb8bdd5a1 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -9019,6 +9019,9 @@ public final class ActivityManagerService extends ActivityManagerNative
     // =========================================================
 
     public int getAppTasksCnt(String callingPackage) {
+        if (mRecentTasks == null) {
+            return 0;
+        }
         final int N = mRecentTasks.size();
         int cnt = 0;
         for (int i = 0; i < N; i++) {