minecart tnt fix

Minecraft.Client/ServerPlayer.cpp

@@ -595,6 +595,7 @@ void ServerPlayer::die(DamageSource *source)
 bool ServerPlayer::hurt(DamageSource *dmgSource, float dmg)
 {
 	if (isInvulnerable()) return false;
+	if (gameMode == nullptr||gameMode->isCreative()) return false;
 
 	// 4J: Not relevant to console servers
 	// Allow falldamage on dedicated pvpservers -- so people cannot cheat their way out of 'fall traps'

Minecraft.Client/ServerPlayerGameMode.cpp

@@ -56,11 +56,10 @@ bool ServerPlayerGameMode::isSurvival()
 	return gameModeForPlayer->isSurvival();
 }
 
-bool ServerPlayerGameMode::isCreative()
-{
-	return gameModeForPlayer->isCreative();
+bool ServerPlayerGameMode::isCreative() {
+    if (!this || !gameModeForPlayer) return false; 
+    return gameModeForPlayer->isCreative();
 }
-
 void ServerPlayerGameMode::updateGameMode(GameType *gameType)
 {
 	if (gameModeForPlayer == GameType::NOT_SET)