gleite

Hello, mine is version 4.3.13 and keeps returning the following message:

Notice: Undefined index: url in /websites/ha/haiderengineering.com.au/wp-content/themes/enhenyero/header.php on line 74

I wetn to line 74, but could not find the problem. This is the “whole code” for that problem. Line 74 is the one where the “if” starts. How can I fix this?

<div class=”col-sm-4 col-md-4″>
<div class=”navbar-header”>
<?php
if( IsNullOrEmptyString( $ert_option[‘opt_site_logo’][‘url’] ) && $ert_option[‘opt_logo_select’] == ‘2’ ):
?>
” class=”navbar-brand image-logo”>” alt=””/>
<?php
else:
?>
“><?php echo get_bloginfo(‘title’); ?>
<?php
endif;
?>
</div>
</div>

Thanks on advance.