mercuryboard has exited with an error

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Undefined index: html_comments

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Notice [8]:
The error was reported on line 1456 of /home/thevioli/public_html/forum/global.php

Code:
1454             }
1455         }
1456         if ($this->sets['html_comments']) {
1457             return "$macro_output return \"<!-- START: $piece -->\r\n{$this->temps[$piece]}\r\n<!-- END: $piece -->\r\n\";";
1458         }

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