I have this issue with falling down under the floor glitch in police station.. Everytime when I go there. The problem appeared after doing some quests from Brothers of steel (finding members of BoS)

Please fix this!

PS. I'm not sure what is causing this glitch.. Is it a missions given by NPCs from BoS or something earlier I have done wrong? How to prevent this bug? Load old save and avoid police station, doing some main quest and after that try again?