diff --git a/net/gobrpc/client.go b/net/gobrpc/client.go
index 240c8cc..bebc01c 100644
--- a/net/gobrpc/client.go
+++ b/net/gobrpc/client.go
@@ -44,6 +44,10 @@ func (c *RPCClient) Call(method string, args interface{}, reply interface{}, cal
 	done := make(chan error, 1)
 
 	go func() {
+		if c.rpcClient == nil {
+			done <- fmt.Errorf("rpc client is nil")
+			return
+		}
 		err := c.rpcClient.Call(method, args, reply)
 		done <- err
 	}()
@@ -59,6 +63,4 @@ func (c *RPCClient) Call(method string, args interface{}, reply interface{}, cal
 	case err := <-done:
 		return err
 	}
-
-	return nil
 }