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@@ -17,7 +17,7 @@ require_once '../inc/global.inc.php';
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api_protect_course_script();
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$noPHP_SELF = true;
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-$header_file = Security::remove_XSS($_GET['file']);
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+$header_file = isset($_GET['file']) ? Security::remove_XSS($_GET['file']) : null;
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$document_id = intval($_GET['id']);
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$course_info = api_get_course_info();
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