diff --git a/db.py b/db.py
index 12008aa7..519dfe3b 100644
--- a/db.py
+++ b/db.py
@@ -1279,16 +1279,16 @@ class Match(Base):
 
     def format_dict(self) -> typing.Dict[str, str]:
         return {
-            "id": self.id,
+            "id": str(self.id),
             "timestamp": self.timestamp.isoformat(),
-            "creator_id": self.creator_id,
+            "creator_id": str(self.creator_id),
             "creator_name": self.creator.mention(),
             "match_title": self.match_title,
-            "match_desc": self.match_desc,
-            "min_players": self.min_players,
-            "max_players": self.max_players,
-            "active_players": self.active_players_count(),
-            "players": len(self.players)
+            "match_desc": self.match_desc if self.match_desc is not None else "",
+            "min_players": str(self.min_players) if self.min_players is not None else "",
+            "max_players": str(self.max_players) if self.max_players is not None else "",
+            "active_players": str(self.active_players_count()),
+            "players": str(len(self.players))
         }
 
 
diff --git a/strings.py b/strings.py
index 830b9614..3ccedb63 100644
--- a/strings.py
+++ b/strings.py
@@ -5,7 +5,7 @@ import typing
 
 class SafeDict(dict):
     def __missing__(self, key):
-        return key
+        return "{" + key + "}"
 
 
 def safely_format_string(string: str, words: typing.Dict[str, str] = None, ignore_escaping=False) -> str:
@@ -26,6 +26,7 @@ class TELEGRAM:
 
     class ERRORS:
         CRITICAL_ERROR = "☢ <b>ERRORE CRITICO!</b>\nIl bot ha ignorato il comando.\nUna segnalazione di errore è stata automaticamente mandata a @Steffo.\n\nDettagli dell'errore:\n<pre>{exc_info}</pre>"
+        CRITICAL_ERROR_QUERY = "☢ ERRORE CRITICO!"
         UNAUTHORIZED_USER = "⚠ Non sono autorizzato a inviare messaggi a {mention}.\nPer piacere, {mention}, inviami un messaggio in privata!"
         UNAUTHORIZED_GROUP = "⚠ Non sono autorizzato a inviare messaggi in <i>{group}</i>.\n@Steffo, aggiungimi al gruppo o concedimi i permessi!"
 
diff --git a/telegrambot.py b/telegrambot.py
index 45205277..e461ee9f 100644
--- a/telegrambot.py
+++ b/telegrambot.py
@@ -434,8 +434,8 @@ def on_callback_query(bot: telegram.Bot, update: telegram.Update):
                     return
                 match.closed = True
                 for player in match.players:
-                    if player.status >= 1:
-                        reply_msg(bot, player.user.telegram_id, strings.MATCHMAKING.GAME_START[player.status], **match.format_dict())
+                    if int(player.status) >= 1:
+                        reply_msg(bot, player.user.telegram_id, strings.MATCHMAKING.GAME_START[int(player.status)], **match.format_dict())
             elif update.callback_query.data == "match_cancel":
                 if not (match.creator == user or user.telegram_id == 25167391):
                     bot.answer_callback_query(update.callback_query.id,
@@ -480,6 +480,13 @@ def on_callback_query(bot: telegram.Bot, update: telegram.Update):
             except BadRequest:
                 pass
     except Exception:
+        try:
+            bot.answer_callback_query(update.callback_query.id,
+                                      show_alert=True,
+                                      text=strings.TELEGRAM.ERRORS.CRITICAL_ERROR_QUERY)
+        except Exception:
+            pass
+        logger.error(f"Critical error: {sys.exc_info()}")
         sentry.user_context({
             "id": update.effective_user.id,
             "telegram": {