GiantbearDEM Lua error: https://pastebin.com/ntXzYPyT My generated database structure: https://pastebin.com/s8gT2kz6 My code: https://pastebin.com/UCuLSKuT The specific area in my code that makes the error pop up is when 'dbStruct' gets inserted in 'FF:addArgs()', it doesn't seem to like it when i use 'group'. When I specify 'inline = true' there it will work without error. My code finished running properly without error and produced the database shown in the pastebin. Here's how the layout of the interface looks like: Working layout with 'inline' enabled: https://imgur.com/a/8SV4SZW Error pop up without 'inline': https://imgur.com/a/KVmTJbi I should add the amount of tabs or the depth of the structure made no difference, same error. If you require my addon to reproduce the error let me know.