Wiki Plugin Throwing an Error

I'm seeing this error on a subdomain blog (http://learning.commons.hwdsb.on.ca) where the wiki plugin is enabled.

WP3.5
Latest version of Wiki.

Notice: Undefined index: post_type in C:\inetpub\wwwroot\wp-content\plugins\wiki\wiki-include.php on line 123 Call Stack: 0.0011 343800 1. {main}() C:\inetpub\wwwroot\index.php:0 0.0012 344248 2. require('C:\inetpub\wwwroot\wp-blog-header.php') C:\inetpub\wwwroot\index.php:17 0.9692 7107256 3. wp() C:\inetpub\wwwroot\wp-blog-header.php:14 0.9692 7107336 4. WP->main() C:\inetpub\wwwroot\wp-includes\functions.php:779 0.9692 7107336 5. WP->parse_request() C:\inetpub\wwwroot\wp-includes\class-wp.php:530 0.9710 7126320 6. apply_filters() C:\inetpub\wwwroot\wp-includes\class-wp.php:306 0.9712 7127312 7. call_user_func_array() C:\inetpub\wwwroot\wp-includes\plugin.php:173 0.9712 7127360 8. Wiki->request() C:\inetpub\wwwroot\wp-includes\plugin.php:173 Variables in local scope (#8): $query_vars = array ()