diff --git a/services/core/java/com/android/server/am/AppErrors.java b/services/core/java/com/android/server/am/AppErrors.java
index a7954bbd624d6..107372da84a61 100644
--- a/services/core/java/com/android/server/am/AppErrors.java
+++ b/services/core/java/com/android/server/am/AppErrors.java
@@ -312,7 +312,11 @@ class AppErrors {
             // and then the delayed summary kill will be a no-op.
             final ProcessRecord p = proc;
             mService.mHandler.postDelayed(
-                    () -> killAppImmediateLocked(p, "forced", "killed for invalid state"),
+                    () -> {
+                        synchronized (mService) {
+                            killAppImmediateLocked(p, "forced", "killed for invalid state");
+                        }
+                    },
                     5000L);
         }
     }