I just tested this myself and I'm not able to replicate. I took a look at the code, and it's just the default behavior for that location. The message occurs if you have someone in your party that hasn't escaped. I never set that particular variable in the mod, so I'm unsure how this could have happened in your particular case :P
You can try using this link to download a save file that I know works for me if you want to try that.