Pretty URLs still lingering

[ncrobin]

I've removed pretty URLs but it's still remaining in the code. It's causing errors needlessly. What should I remove to make this go away, or add to fix?

Error:

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Apply Filter: Only show the error messages of this URLhttp://www.xxxx.com/forums/index.php?board=6.0;sort=views
Apply Filter: Only show the errors with the same message
8: Undefined index: pretty
Apply Filter: Only show the errors from this file File: /home/xxx/public_html/xxx.com/forums/Sources/MessageIndex.php
Line: 50

Code:

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==>50: if ((isset($context['pretty']['oldschoolquery']) || $context['pretty']['query_string']['board'] != $context['pretty']['board_urls'][$board]) && $modSettings['pretty_enable_filters'])