add try...catch around updating a guild member

src/usersyncroniser.ts

@@ -344,11 +344,15 @@ export class UserSyncroniser {
         await Promise.all(
             wantRooms.map(
                 async (roomId) => {
+                    try {
                         if (doJoin) {
                             await this.JoinRoom(member, roomId);
                         } else {
                             await this.ApplyStateToRoom(state, roomId, member.guild.id);
                         }
+                    } catch (err) {
+                        log.error(`Failed to update ${member.id} (${member.user.username}) in ${roomId}`, err);
+                    }
                 },
             ),
         );