Thanks @KhrysAK47 for reporting this issue.

I've added error handling to clean up 'bad' data provided from the 'config.yml' for the healthLevel, hungerLevel, xpLevel and xpPoints data properties. If an unsafe value is provided from the 'config.yml', the value will default to the Minecraft default value. For example, if the 'healthLevel' was 100.0 in 'config.yml', the player's health will be set to 20.0.