Lua & C++ - Game Quest Fix -- 2

I'm running a game server using C++ and Lua for in-game quests. I'm encountering some errors and need help to debug and review my quest logic and a bit help with explanations.

Errors include:
- Wrong QUEST_WAIT request
- Null PC pointer in quest timer event

Issues with quest state storage in SQL, leading to quests becoming invisible in-game.
9 test_dungeon exit_time 1753586338
9 test_dungeon status 1390588616
after removing from database, quest work again (but in quest isnt an check for it, which could block).

I need:
- Lua script debugging / fixing
- Review of quest logic with C++ code integration

Ideal skills and experience:
- Proficiency in Lua and C++
- Experience with game server development
- Strong debugging skills

Looking forward to your expertise!