RocketChat/Rocket.Chat · error · Error

Mention bot - Failed to retrieve room information

Error message

Mention bot - Failed to retrieve room information

What it means

Thrown by Rocket.Chat's mention bot core app (MentionModule, appId 'mention-core'). When a user clicks 'share-message' on the banner shown after mentioning users who cannot see the room, the module loads the clicker's own subscription via Subscriptions.findOneByRoomIdAndUserId(room, user._id) to build a deep link to the message. A null result means the server no longer considers this user a member of the room the banner was rendered in, so the share is aborted.

Source

Thrown at apps/meteor/server/modules/core-apps/mention.module.ts:79

		if (actionId === 'add-users') {
			void addUsersToRoomMethod(user._id, { rid: room, users: usernames as string[] }, user);
			void api.broadcast('notify.ephemeralMessage', user._id, room, {
				msg: i18n.t('You_mentioned___mentions__but_theyre_not_in_this_room', {
					mentions: joinedUsernames,
					lng: user.language,
				}),
				tmid: message.tmid,
				_id: payload.message,
				mentions,
			});
			return undefined;
		}

		if (actionId === 'share-message') {
			const sub = await Subscriptions.findOneByRoomIdAndUserId(room, user._id, { projection: { t: 1, rid: 1, name: 1 } });
			// this should exist since the event is fired from withing the room (e.g the user sent a message)
			if (!sub) {
				throw new Error('Mention bot - Failed to retrieve room information');
			}

			const roomPath = roomCoordinator.getRouteLink(sub.t, { rid: sub.rid, name: sub.name });
			if (!roomPath) {
				throw new Error('Mention bot - Failed to retrieve path to room');
			}

			const messageText = i18n.t('Youre_not_a_part_of__channel__and_I_mentioned_you_there', {
				channel: `#${sub.name}`,
				lng: user.language,
			});

			const link = new URL(Meteor.absoluteUrl(roomPath));
			link.searchParams.set('msg', message._id);
			const text = `[ ](${link.toString()})\n${messageText}`;

			// forwards message to all DMs
			await processWebhookMessage(

View on GitHub (pinned to b2c16d5842)

Solutions

1. Re-check that the user is still a member of the room before showing or handling 'share-message', and hide the action if not
2. If membership was lost, have the user rejoin the room, re-send the mention, and use the fresh banner
3. Catch the error where UiKit actions are executed and reply with an ephemeral 'you are no longer in this room' notice instead of surfacing a server error
4. If it reproduces for an active member, inspect the subscriptions collection for a missing/corrupt document for that rid+uid pair

Example fix

// before
await mentionModule.blockAction(payload); // may throw 'Mention bot - Failed to retrieve room information'

// after
const sub = await Subscriptions.findOneByRoomIdAndUserId(payload.room!, payload.user!._id, { projection: { t: 1 } });
if (!sub) {
  void api.broadcast('notify.ephemeralMessage', payload.user!._id, payload.room!, { msg: 'You are no longer in this room' });
  return;
}
await mentionModule.blockAction(payload);

const canShareMessage = async (userId: string, rid: string): Promise<boolean> =>
  Boolean(await Subscriptions.findOneByRoomIdAndUserId(rid, userId, { projection: { _id: 1 } }));

try {
  await mentionModule.blockAction(payload);
} catch (error) {
  if (error instanceof Error && error.message === 'Mention bot - Failed to retrieve room information') {
    // user lost membership mid-flow; show an ephemeral notice instead of failing
    return notifyMembershipLost(payload.user!._id, payload.room!);
  }
  throw error;
}

When it happens

Trigger: A UiKit blockAction dispatched with appId 'mention-core' and actionId 'share-message' where Subscriptions.findOneByRoomIdAndUserId(payload.room, user._id) returns null: the user left or was removed from the channel after the banner rendered, or the payload carries a stale/incorrect room id.

Common situations: User leaves (or is kicked from) a channel while the 'you mentioned users not in this room' banner is still on screen, then clicks Share; hand-built UiKit payloads in tests pointing at a room the user never joined.

Related errors

• Mention bot - Failed to retrieve path to room
• Invalid payload
• Invalid app provided
• Type not supported
• error-roomId-param-invalid

AI-assisted analysis of RocketChat/Rocket.Chat@b2c16d5842 (2026-08-18). Data as JSON: /api/errors/78491f68ea3c3dbd. Report an issue: GitHub.