Hello Luckperms developer/s! My name is Almir R. Mamilic. I ma currently using your plugin and it is a very good permission manager plugin. But this time, I got this unusual error that popped out suddenly. I hope you can help me. Thank you so much =D

Here's a pastebin link for the error
https://pastebin.com/aAabie7r

It appears that the way you configured your prefix/suffix stacking is incorrect.

Feel free to post that part here, should you not be able to fix it yourself.

Sorry for the late response. Here's the config for my prefix/suffix stacking https://pastebin.com/DTMWzbVA
And in addition, I copy pasted the config before I put the highest in the suffix format. It was empty before. Just tellin you maybe it was the cause. But please help me :(

Thank you

Very strange, the configuration looks ok to me.

Perhaps worth resetting that part of it and starting again? I can't see anything super obvious there.