Thanks, I will look into this, I would assume its due to the high volume of calls made when fire damage is used. Although a couple things to note
This shouldn't be an issue as it rate limits itself
The errors isn't actually within the plugin itself, the error quoted above was actually just before calling the plugin, where it failed to call the hook itself.
I will try and replicate this, and get back to you asap with the cause and a fix.
Although this may take me some short time to try to replicate. I have it running on 10 servers myself, and have not seen this yet but will try today/tomorrow to replicate it.