diff --git a/service/src/com/android/server/BpfNetMaps.java b/service/src/com/android/server/BpfNetMaps.java
index 029c1e2..fae518c 100644
--- a/service/src/com/android/server/BpfNetMaps.java
+++ b/service/src/com/android/server/BpfNetMaps.java
@@ -936,7 +936,9 @@
         // deletion. netd and skDestroyListener could delete CookieTagMap entry concurrently.
         // So using Set to count the number of entry in the map.
         Set<K> keySet = new ArraySet<>();
-        map.forEach((k, v) -> keySet.add(k));
+        if (map != null) {
+            map.forEach((k, v) -> keySet.add(k));
+        }
         return keySet.size();
     }