diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index c8e9402e64424..c229869047467 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -2692,7 +2692,7 @@ public abstract class PackageManager {
      * @return Returns an array of one or more packages assigned to the user
      * id, or null if there are no known packages with the given id.
      */
-    public abstract String[] getPackagesForUid(int uid);
+    public abstract @Nullable String[] getPackagesForUid(int uid);
 
     /**
      * Retrieve the official name associated with a user id.  This name is
@@ -2705,7 +2705,7 @@ public abstract class PackageManager {
      * @return Returns a unique name for the given user id, or null if the
      * user id is not currently assigned.
      */
-    public abstract String getNameForUid(int uid);
+    public abstract @Nullable String getNameForUid(int uid);
 
     /**
      * Return the user id associated with a shared user name. Multiple
diff --git a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
index cb3bcb087b547..75b37c2ad8e76 100644
--- a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
+++ b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
@@ -2319,9 +2319,11 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
         final String[] packages = mContext.getPackageManager().getPackagesForUid(uid);
         final int userId = UserHandle.getUserId(uid);
 
-        for (String packageName : packages) {
-            if (!mUsageStats.isAppIdle(packageName, uid, userId)) {
-                return false;
+        if (!ArrayUtils.isEmpty(packages)) {
+            for (String packageName : packages) {
+                if (!mUsageStats.isAppIdle(packageName, uid, userId)) {
+                    return false;
+                }
             }
         }
         return true;