I am currently doing the Fun and Games quest in Grafton Steel and the game seems to have got stuck - I am very close (I think the compass is saying about 20) to Ra-Ra's toy but there is a security door blocking my path.

Ra-Ra said to kill some robots before she last went into the vent, but no robots have spawned and the quest objective itself doesn't say to kill any robots. Seems like a bug but I don't want to lose my progress in this long dungeon when I'm so close to the end - has anybody else experienced something similar or know any way to work around this?

Edit: I've just checked the Pip-Boy's journal entry and that does say to kill the robots, but none have spawned.