Missing quest descriptor

0.8 g44963bc
Windows 10

After doing the inhaler quest Casey Campbell offered the quest of “Someone forgot to code this message id is MISSION_NULL, topic is offer!”. I don’t know if it’s related, but asking her to teach is causing the game to hang. Also, an NPC in the lab at my start caused a hang when asking for a mission; I think this is because the engine was searching for a house to spawn a pc in for the USB mission, but it was searching on the current Z level (-4, was never gonna happen).