Prevent possible segfault on picking message IDs for deletion

telegram/commands.go

@@ -251,6 +251,7 @@ func (c *Client) ProcessChatCommand(chatID int64, cmdline string) (string, bool)
 		if c.me == nil {
 			return "@me is not initialized", true
 		}
+
 		var limit int32
 		if len(args) > 0 {
 			limit64, err := strconv.ParseInt(args[0], 10, 32)
@@ -275,7 +276,9 @@ func (c *Client) ProcessChatCommand(chatID int64, cmdline string) (string, bool)
 
 		var messageIds []int64
 		for _, message := range messages.Messages {
-			messageIds = append(messageIds, message.Id)
+			if message != nil {
+				messageIds = append(messageIds, message.Id)
+			}
 		}
 
 		_, err = c.client.DeleteMessages(&client.DeleteMessagesRequest{