diff --git a/app/mission-tab/[missionId]/page.tsx b/app/mission-tab/[missionId]/page.tsx
index 7fb3e52..1c6e470 100644
--- a/app/mission-tab/[missionId]/page.tsx
+++ b/app/mission-tab/[missionId]/page.tsx
@@ -434,7 +434,7 @@ export default function MissionTabDetailPage() {
                     return true;
                   };
                   return isValid(mission.rocketChatChannelId);
-                })() && (() => {
+                })() && mission.rocketChatChannelId && (() => {
                   // Build RocketChat URL: parole.slm-lab.net/channel/[channelId]
                   // If it's already a full URL, use it; otherwise build from ID
                   const rocketChatUrl = mission.rocketChatChannelId.startsWith('http')