Invalid argument supplies foreach()

[Guest]

Hello all,

 

upon login to the store, in the categories box, get an error:

 

Warning: Invalid argument supplied foreach()

in /home/xxxx /catalog/includes/modules/main_categories.php on line 50, which is the section for:

 

// Traverse category tree

foreach ($foo as $kdy => $value) {

if ($foo[$key}

 

 

This is a generic SEC install, no addons, etc. . . .