diff --git a/core/src/main/java/org/lsposed/lspd/service/PackageService.java b/core/src/main/java/org/lsposed/lspd/service/PackageService.java
index 95c91e3a..a8bc0c3e 100644
--- a/core/src/main/java/org/lsposed/lspd/service/PackageService.java
+++ b/core/src/main/java/org/lsposed/lspd/service/PackageService.java
@@ -81,7 +81,8 @@ public class PackageService {
     private static IBinder binder = null;
 
     static boolean isAlive() {
-        return binder != null && binder.isBinderAlive();
+        var pm = getPackageManager();
+        return pm != null && pm.asBinder().isBinderAlive();
     }
 
     private static final IBinder.DeathRecipient recipient = new IBinder.DeathRecipient() {