diff --git a/client/decoders.go b/client/decoders.go
index 77299d25..4cc3a0d4 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -242,7 +242,7 @@ func decodeGroupMessagePacket(c *QQClient, seq uint16, payload []byte) (interfac
 		})
 		return nil, nil
 	}
-	if pkt.Message.Content.PkgNum > 1 {
+	if pkt.Message.Content != nil && pkt.Message.Content.PkgNum > 1 {
 		var builder *groupMessageBuilder
 		i, ok := c.groupMsgBuilders.Load(pkt.Message.Content.DivSeq)
 		if !ok {