[Children, school and learning] Opening schedule tab spams null ref errors

[Niilo007]

IMPORTANT:

Please first search existing bugs to ensure you are not creating a duplicate bug report!
Make sure you have the latest version of Rimworld!

Describe the bug

!!! bug description here !!!

Steps to reproduce the behavior (VERY IMPORTANT)

1. Have a save with Children, school and learning
2. Open the schedule tab
3. errors

Error Logs

Player.log

!!! Link to contents of Player.log or Error.log (MUST BE LINK) !!!

HugsLib log

https://gist.github.com/70ebbbb0dcc42099c8a30fc83fa7b902

Save file

!!! Please add a save file where the issue occurs to speed up testing and fixing of the issue !!!

Screenshots

Mod list (Preferably a RimPy compatible list.)

• Harmony
• Core
• Royalty (Optional)
• Ideology (Optional)
• HugsLib
• Children, school and learning https://steamcommunity.com/sharedfiles/filedetails/?id=1541438230
• RimThreaded