What the hell?
This is the generated code:
          $this->startdate = $old_value_startdate;
              $this->startdate_hora = $old_value_startdate_hora = ;
$this->enddate = $old_value_enddate;
              $this->enddate_hora = $old_value_enddate_hora = ;
$this->priority = $old_value_priority;
Notice my date field, it generated code like above, and of course cannot be use.
Please fix it as soon as possible!!!