bugfix(loadscreen): Prevent null pointer dereference when accessing game slot

Author: seer-by-sentry[bot]

Core/GameEngine/Source/GameClient/GUI/LoadScreen.cpp

@@ -1986,7 +1986,8 @@ void MapTransferLoadScreen::init( GameInfo *game )
 		GadgetStaticTextSetText(m_progressText[netSlot], UnicodeString::TheEmptyString );
 		m_progressText[netSlot]->winSetEnabledTextColors(houseColor, m_progressText[netSlot]->winGetEnabledTextBorderColor());
 
-		if ((i == 0 || (TheGameInfo->getConstSlot(i)->isHuman() && TheGameInfo->getConstSlot(i)->hasMap())) && m_progressBars[netSlot])
+		const GameSlot *gameInfoSlot = TheGameInfo->getConstSlot(i);
+		if ((i == 0 || (gameInfoSlot && gameInfoSlot->isHuman() && gameInfoSlot->hasMap())) && m_progressBars[netSlot])
 			m_progressBars[netSlot]->winHide(TRUE);
 
 		m_playerLookup[i] = netSlot; // save our mapping so we can update progress correctly