Prevent game crash if started with one player

Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/game/games/mineware/BawkBawkBattles.java

@@ -87,6 +87,7 @@ import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeColorCha
 import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeDeadlyTnt;
 import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeDiamondHunt;
 import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeEggSmash;
+import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeEmpty;
 import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeFallingBlocks;
 import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeFastFood;
 import nautilus.game.arcade.game.games.mineware.challenge.type.ChallengeKangarooJump;
@@ -381,27 +382,33 @@ public class BawkBawkBattles extends TeamGame implements IThrown
 
 	private Challenge selectChallenge()
 	{
-		int limit = _list.size();
+		if (GetPlayers(false).size() > MIN_PLAYERS_BLOCK_ATTEMPT)
-		int attemps = 0;
-
-		Challenge instance = _list.random();
-
-		while (!isSuitable(instance))
 		{
-			if (attemps < limit)
+			int limit = _list.size();
-			{
+			int attemps = 0;
-				instance = _list.random();
-				attemps++;
-			}
-			else
-			{
-				_list.resetPlayed();
-				attemps = 0;
-			}
-		}
 
-		System.out.println("Found matching challenge: " + instance.getName());
+			Challenge instance = _list.random();
-		return instance;
+
+			while (!isSuitable(instance))
+			{
+				if (attemps < limit)
+				{
+					instance = _list.random();
+					attemps++;
+				}
+				else
+				{
+					_list.resetPlayed();
+					attemps = 0;
+				}
+			}
+
+			return instance;
+		}
+		else
+		{
+			return new ChallengeEmpty(this);
+		}
 	}
 
 	private boolean isSuitable(Challenge instance)

Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/game/games/mineware/challenge/type/ChallengeEmpty.java

@@ -0,0 +1,40 @@
+package nautilus.game.arcade.game.games.mineware.challenge.type;
+
+import java.util.ArrayList;
+
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+
+import nautilus.game.arcade.game.games.mineware.BawkBawkBattles;
+import nautilus.game.arcade.game.games.mineware.challenge.Challenge;
+import nautilus.game.arcade.game.games.mineware.challenge.ChallengeType;
+
+/**
+ * This challenge is used to prevent the game from crashing if it's forced to start with only one player.
+ */
+public class ChallengeEmpty extends Challenge
+{
+	public ChallengeEmpty(BawkBawkBattles host)
+	{
+		super(host, ChallengeType.FirstComplete, "Empty", new String[] { "Not enough players" });
+		
+		Settings.setUseMapHeight();
+	}
+
+	@Override
+	public ArrayList<Location> createSpawns()
+	{
+		ArrayList<Location> spawns = new ArrayList<>();
+		spawns.add(getCenter().add(0, 1, 0));
+		return spawns;
+	}
+
+	@Override
+	public void createMap()
+	{
+		Block center = getCenter().getBlock();
+		center.setType(Material.BARRIER);
+		addBlock(center);
+	}
+}