<font face="Arial, Verdana">Hi Seth,</font>
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<font face="Arial, Verdana">According to Stack Overflow, the non-numeric error is a PHP7 error and sticking an (int) in front of $vn_start should solve the problem? Does this sound right? The error messages are filling my server log reports!</font>
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<font face="Arial, Verdana">(($vn_key_start = (int)$vn_start - 5000) < 0) { $vn_key_start = 0; }</font>