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fix error log when HTTP_USER_AGENT is missing #319

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fix error log when HTTP_USER_AGENT is missing #319

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2 changes: 1 addition & 1 deletion util/crayon_util.class.php
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Original file line number Diff line number Diff line change
Expand Up @@ -790,7 +790,7 @@ public static function preg_escape_back($string) {

// Detect if on a Mac or PC
public static function is_mac($default = FALSE) {
$user = $_SERVER['HTTP_USER_AGENT'];
$user = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : '';
if (stripos($user, 'macintosh') !== FALSE) {
return TRUE;
} else if (stripos($user, 'windows') !== FALSE || stripos($user, 'linux') !== FALSE) {
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