Harold, I sent you a message, thanks.

I'm still looking for a volunteer. If anyone is experiencing the referenced exception on a continuous basis, please reach out to me at Discord (@terceran.). I just need someone to run a debug version of the plugin and show me the log file. Thanks!

I'm still getting the errors in the console on a regular basis.

Fixed in 6.4.4. Thanks to MrLiquid and MetalHead for the assistance.