- wxMemoryDC temp_dc;
- wxRect invalid_rect = m_art->GetPageBackgroundRedrawArea(temp_dc, this, m_old_size, new_size);
- Refresh(true, &invalid_rect);
+ if (m_art)
+ {
+ wxMemoryDC temp_dc;
+ wxRect invalid_rect = m_art->GetPageBackgroundRedrawArea(temp_dc, this, m_old_size, new_size);
+ Refresh(true, &invalid_rect);
+ }