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[TurboPT]

I found the issues causing that error ... a very minor thing the way a variable is initialized as a string and not an array.

It is PHP 7.1 related: (I have PHP 7.1.1, and I saw a similar error on a different line number)

Note: As of PHP 7.1.0, applying the empty index operator on a string throws a fatal error. Formerly, the string was silently converted to an array.

I'll commit the change in a moment.

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Change committed to SVN.