PHP error $profile_fields caused within foreach on line 136

Error I got:
Invalid argument supplied for foreach() in /xxx/sites/all/modules/profileplus/profileplus.module on line 136.

I added "an if clauses" before foreach loop to check if $profile_fields is an array. If it is not, I continue

                $entry = array();
                if(!is_array($profile_fields)){
                  continue;
                }
                foreach($profile_fields as $category => $fields) {
                  foreach($fields as $field) {
                    $entry[] = $field['value'];
                  }
                  $view = implode(' | ', $entry);
                }

I haven't dig further for the exact cause. I guess some user profile is not loaded as an array.