Cannot read property 'tolowercase' of undefined error?

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Joined
Mar 25, 2017
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1
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11
Age
28
So weirdly enough the plugin I was using worked perfectly before, then after about an hour without changing any plugins at all, I play tested the game and suddenly the error: Cannot read property 'tolowercase' of undefined popped up. I'm not sure on how to solve the problem.
 

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