Right sidebear disappear

Hi,
I would like to report an error in the footer.php.
I realized that when Event Calendar WD plugin is used with theme, right sidebar disappear when single event is shown.
The problem is a line code in top of footer.php file.
Commenting the follow line of code, the problem will be solved.
global $bfa_ata, $cols, $left_col, $left_col2, $right_col, $right_col2;