fix

bots/modules/ping.py

@@ -1,6 +1,7 @@
 from django.db import models
 from jsonfield import JSONField
 from telegram import Update
+from telegram.error import BadRequest
 from telegram.ext import Dispatcher, CallbackContext, CommandHandler
 from telegram.utils.helpers import mention_html
 
@@ -58,8 +59,11 @@ class PingBotModuleConfig(TelegramBotModuleConfig):
             return update.effective_message.reply_text(self.no_users_text)
         mentions = []
         for uid in cat.user_ids:
+            try:
                 member = ctx.bot.get_chat_member(update.effective_chat.id, uid)
                 mentions.append(mention_html(uid, '#{} [{}]'.format(uid, member.user.full_name)))
+            except BadRequest:
+                cat.remove_user(uid)
         update.effective_message.reply_html(self.message_template.format(mentions='; '.join(mentions)))
 
     def categories_handler(self, update: Update, ctx: CallbackContext):