1) no need to double check it the events checks what you are clicking https://prnt.sc/qugm1s
2) https://prnt.sc/qugmt7 Always check the npc id before you run the main code saves on running uneeded code
3) Dont captalize plugin dirs
4) When writing Strings in kt dont use + use {} looks cleaner eg:

"You must wait another + 600 - (System.currentTimeMillis() - player.altarDelay)) * 0.001 + seconds before being able to do this again.")

"You must wait another ${(600 - (System.currentTimeMillis() - player.altarDelay)) * 0.001} seconds before being able to do this again.")