Fix batcher panic

op-batcher/batcher/service.go

@@ -290,9 +290,11 @@ func (bs *BatcherService) Stop(ctx context.Context) error {
 	bs.Log.Info("Stopping batcher")
 
 	var result error
+	if bs.driver != nil {
 		if err := bs.driver.StopBatchSubmittingIfRunning(ctx); err != nil {
 			result = errors.Join(result, fmt.Errorf("failed to stop batch submitting: %w", err))
 		}
+	}
 
 	if bs.rpcServer != nil {
 		// TODO(7685): the op-service RPC server is not built on top of op-service httputil Server, and has poor shutdown
@@ -328,7 +330,7 @@ func (bs *BatcherService) Stop(ctx context.Context) error {
 
 	if result == nil {
 		bs.stopped.Store(true)
-		bs.driver.Log.Info("Batch Submitter stopped")
+		bs.Log.Info("Batch Submitter stopped")
 	}
 	return result
 }