Assert failed: "false" in file serviceprovider.cpp:202

assert failed: "false" in file serviceprovider.cpp:202

This usually means that some service (adding a shop or teleport to an npc)npc that usually wouldn't or won't accept it) was being rejected and will work again once it is removed. For shops you can try and remove specific items through trial and error (some seem to trigger this error, but it hasn't been confirmed as to which)