No method getElementName for this instance of the class RulesOr - when on the admin/people/create page

When on the create user page as an admin we are getting an error from the rules module - this looks to be the same issue as here #1311310: No method getElementName for this instance of the class RulesOr.

It looks like the problem is in the function uc_coupon_workflow_suspend_element

foreach ($rule->conditions() as $condition) {
  if ($condition->getElementName() == 'uc_coupon_workflow_suspended' && (!$events || count(array_intersect($rule->events(), $events)))) {
    $found[] = $rule->label;
  }
}

Not all the rule conditions have the method getElementName - a nasty fix would be something like

foreach ($rule->conditions() as $condition) {
          if ($condition instanceof RulesAbstractPlugin){
            if ($condition->getElementName() == 'uc_coupon_workflow_suspended' && (!$events || count(array_intersect($rule->events(), $events)))) {
                $found[] = $rule->label;
            }
          }
        }