ok so when creating first kit then add second kit it wont write it to the config and causes the plugin to crash since last update

'last update' is a month old now, you are the only one reporting a problem... and not very well i might add. where is the crash, where are logs, configs, video clips of the issue??

What are the steps you are using to create the second kit ?

I have just opened kit = /kit
and clicked on create new = gives me a panel with empty slots/sections
I filled in the panels for name , usage, cooldown added inventory items and saved the kit
then i opened the data file
\oxide\data\Kits\kits_data.json 
and finished editing the file (unload plugin)  by adding image etc and saved it again , then reload plugin,

* because of keybind issues i cannot fully edit the kit in chat so have to open the data file to complete the setup, you might not have that issue, if you dont,  you dont have to unload the plugin when editing it in chat