I dont expect a fix for the 1.12.2 version but it would be nice
latest.log

yes no fix indeed, you have to fix the too long string, then this issue goes away. I think the max length is 32k character per string

I have gone through all the quests and the only thing that is above 30k characters is the player data itself in the config . I am gonna see if I can get it lowered in any way