Supercourier
First time out of the vault

I tried searching the whole internet, I found nothing, I encountered a bug on the mission "Curtain Call at the Tampico", after I kill Dean Domino, a window saying "Dean has died" pops up and it won't let me close it, I keep pressing OK and it would just dont disappear, please help me find a solution to this bug, I'd prefer nothing complicated, making me go back the saves, I'd really appreciate it you would find a fix, I've been trying to find a solution for 2 hours.