When a script fails after working it means that it is an external issue. In this instace, it appears that your external factors are the server and the warcraft database, this means that one of the two must be throwing an error. Considering it is a 500 and you have no heard similar situations ariasing with the warcraft API, I would guess that it is a server error. Do other PHP scripts work? If they do try to figure out which command is throwing the fit and go form there.

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