Quest Stuck - Lachlann Graves POE2

After Lachlann runs through the gates, the game crashed and I booted back up to him being frozen in front of the graves. This is after acquiring both keys in the Cemetary of the Eternals. He's saying to follow him and that there's much to do.

Quest - Sorrow Among Stones - Follow Lachlann

Thanks for looking into this guys!

I thought i should post this here since it's similar. During the lachlann fight he hit me with a ground attack that travels in a long line, while trying to move out of it my game crashed. When i logged back in he was frozen in the same position but when i attacked him the fight resumed. I was able to complete the quest.

I have the same problem. I teleported to town while he was entering the arena. After returning he is just standing before the grave and gives me his regular dialog lines.
The quest is "Sorrow Among Stones" - Follow Lachlann.
This happened on Cruel Act 1.

Edit:
I solved it by going to a different map, and clicking Ctrl + Lclick to reset the cemetary.

Happened to me the same and same way, thank you very much for your solution. :)