diff --git a/client/client.go b/client/client.go
index 1d89bba8..103cf372 100644
--- a/client/client.go
+++ b/client/client.go
@@ -1016,13 +1016,11 @@ func (c *QQClient) netLoop() {
 				if err != nil {
 					c.Debug("decode pkt %v error: %+v", pkt.CommandName, err)
 				}
-				if f, ok := c.handlers.Load(pkt.SequenceId); ok {
-					c.handlers.Delete(pkt.SequenceId)
+				if f, ok := c.handlers.LoadAndDelete(pkt.SequenceId); ok {
 					f.(func(i interface{}, err error))(rsp, err)
 				}
-			} else if f, ok := c.handlers.Load(pkt.SequenceId); ok {
+			} else if f, ok := c.handlers.LoadAndDelete(pkt.SequenceId); ok {
 				// does not need decoder
-				c.handlers.Delete(pkt.SequenceId)
 				f.(func(i interface{}, err error))(nil, nil)
 			} else {
 				c.Debug("\nUnhandled Command: %s\nSeq: %d\nThis message can be ignored.", pkt.CommandName, pkt.SequenceId)
diff --git a/client/notify.go b/client/notify.go
index 41508fff..af447932 100644
--- a/client/notify.go
+++ b/client/notify.go
@@ -2,8 +2,9 @@ package client
 
 import (
 	"fmt"
-	"github.com/Mrs4s/MiraiGo/client/pb/notify"
 	"strconv"
+
+	"github.com/Mrs4s/MiraiGo/client/pb/notify"
 )
 
 type (
diff --git a/go.mod b/go.mod
index 0f0a1d10..e5cab35d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/Mrs4s/MiraiGo
 
-go 1.14
+go 1.15
 
 require (
 	github.com/golang/protobuf v1.4.3