That is a really old flashcard! Have you checked if it have any update available? Could be triggering some sort of anti-piracy (or just working unreliably enough for the game to crash), and maybe an update could mitigate that.
Also, are you playing on a DS/DS Lite? If you are on a DSi and above, you could try nds-bootstrap via TWiLight Menu++, its capable of playing that game just fine without problems.