In the first task for the guild. I go to the tavern under the sturgeon and meet Nerlan. Then there is the scene where we go to the house, where the nerlan makes the thefts, then the game does not go on, there is no guard of a fiery fist. I do not know how to solve it

Help me :)

This is a known Bug since version 2.5.(17 ?).

Some people wrote that reloading and redoing the heist a few times worked for them.

Aside from this you could try a rollback to a earlier version with galaxy or pray for a new patch.