diff --git a/core/src/main/java/org/lsposed/lspd/service/BridgeService.java b/core/src/main/java/org/lsposed/lspd/service/BridgeService.java
index 07b04c80..8feeda4f 100644
--- a/core/src/main/java/org/lsposed/lspd/service/BridgeService.java
+++ b/core/src/main/java/org/lsposed/lspd/service/BridgeService.java
@@ -121,7 +121,7 @@ public class BridgeService {
     private static Listener listener;
 
     // For service
-    private static void sendToBridge(IBinder binder, boolean isRestart) {
+    private static synchronized void sendToBridge(IBinder binder, boolean isRestart) {
         do {
             bridgeService = ServiceManager.getService(SERVICE_NAME);
             if (bridgeService != null && bridgeService.pingBinder()) {
@@ -160,6 +160,7 @@ public class BridgeService {
                 data.writeInt(ACTION.ACTION_SEND_BINDER.ordinal());
                 Log.v(TAG, "binder " + binder.toString());
                 data.writeStrongBinder(binder);
+                if (bridgeService == null) break;
                 res = bridgeService.transact(TRANSACTION_CODE, data, reply, 0);
                 reply.readException();
             } catch (Throwable e) {