Poormanscron generating "Invalid argument supplied in foreach()" with taxonomy_hide module

I don't see where to submit issue's for taxonomy_hide module, so writing here (may be it is actually poormanscron bug) and in the forum.

I'm using Drupal 4.7.0 (patched to 4.7.3) & taxonomy_hide rev. 1.2 from cvs and regularly receiving error in logs:
Invalid argument supplied for foreach() in /var/www/....../modules/contrib/taxonomy_hide.module in row 67. upon every run of poormanscron (rev. 1.17). The number on error lines varies with each poormanscron execution.

The line in question is the line with foreach ($node->taxonomy as $key => $value) from function taxonomy_hide_nodeapi:

function taxonomy_hide_nodeapi(&$node, $op, $arg = 0, $arg2 = 0) {
  if (!module_exist('taxonomy')) {
    return;
  }
 
  switch ($op) { 
    case 'view':
      $hidden = variable_get('taxonomy_hide_vocabularies', array ());
      if (count($hidden) == 0 && !variable_get('taxonomy_hide_group_by_vocabulary', 0)) {
        return;
      }
      foreach ($node->taxonomy as $key => $value) {
        if ($hidden[$value->vid]) {
          unset($node->taxonomy[$key]);
        }
      }
      break;
  }
  return;
}

What does poormanscron do that causes this error?

Thank you.