src/main/java/StevenDimDoors/mod_pocketDim/commands/CommandCreateDungeonRift.java

@@ -63,17 +63,26 @@ public class CommandCreateDungeonRift extends DDCommandBase
 		{
 			result = findDungeonByPartialName(command[0], dungeonHelper.getUntaggedDungeons());
 		}
+		
 		// Check if we found any matches
 		if (result != null)
 		{
-			//Create a rift to our selected dungeon and notify the player
 			dimension = PocketManager.getDimensionData(sender.worldObj);
 			link = dimension.createLink(x, y + 1, z, LinkTypes.DUNGEON, orientation);
-			PocketBuilder.generateSelectedDungeonPocket(link, mod_pocketDim.properties, result);
+			if (PocketBuilder.generateSelectedDungeonPocket(link, mod_pocketDim.properties, result))
+			{
+				// Create a rift to our selected dungeon and notify the player
 				sender.worldObj.setBlock(x, y + 1, z, mod_pocketDim.blockRift.blockID, 0, 3);
 				sendChat(sender, "Created a rift to \"" + result.schematicName() + "\" dungeon (Dimension ID = " + link.destination().getDimension() + ").");
 			}
 			else
+			{
+				// Dungeon generation failed somehow. Notify the user and remove the useless link.
+				dimension.deleteLink(link);
+				sendChat(sender, "Dungeon generation failed unexpectedly!");
+			}
+		}
+		else
 		{
 			//No matches!
 			return new DDCommandResult("Error: The specified dungeon was not found. Use 'dd-list' to see a list of the available dungeons.");

src/main/java/StevenDimDoors/mod_pocketDim/commands/CommandCreateRandomRift.java

@@ -69,17 +69,26 @@ public class CommandCreateRandomRift extends DDCommandBase
 			{
 				result = getRandomDungeonByPartialName(command[0], dungeonHelper.getUntaggedDungeons());
 			}
+			
 			// Check if we found any matches
 			if (result != null)
 			{
-				//Create a rift to our selected dungeon and notify the player
 				dimension = PocketManager.getDimensionData(sender.worldObj);
 				link = dimension.createLink(x, y + 1, z, LinkTypes.DUNGEON, orientation);
-				PocketBuilder.generateSelectedDungeonPocket(link, mod_pocketDim.properties, result);
+				if (PocketBuilder.generateSelectedDungeonPocket(link, mod_pocketDim.properties, result))
+				{
+					// Create a rift to our selected dungeon and notify the player
 					sender.worldObj.setBlock(x, y + 1, z, mod_pocketDim.blockRift.blockID, 0, 3);
 					sendChat(sender, "Created a rift to \"" + result.schematicName() + "\" dungeon (Dimension ID = " + link.destination().getDimension() + ").");
 				}
 				else
+				{
+					// Dungeon generation failed somehow. Notify the user and remove the useless link.
+					dimension.deleteLink(link);
+					sendChat(sender, "Dungeon generation failed unexpectedly!");
+				}
+			}
+			else
 			{
 				//No matches!
 				return new DDCommandResult("Error: The specified dungeon was not found. Use 'list' to see a list of the available dungeons.");

src/main/java/StevenDimDoors/mod_pocketDim/world/PocketBuilder.java

@@ -145,7 +145,7 @@ public class PocketBuilder
 		return true;    
 	}
 
-	public static boolean generateSelectedDungeonPocket(DimLink link, DDProperties properties, DungeonData data)
+	public static boolean generateSelectedDungeonPocket(DimLink link, DDProperties properties, DungeonData dungeon)
 	{
 		if (link == null)
 		{
@@ -155,11 +155,18 @@ public class PocketBuilder
 		{
 			throw new IllegalArgumentException("properties cannot be null.");
 		}
-
 		if (link.hasDestination())
 		{
 			throw new IllegalArgumentException("link cannot have a destination assigned already.");
 		}
+		if (dungeon == null)
+		{
+			throw new IllegalArgumentException("dungeon cannot be null.");
+		}
+
+		// Try to load up the schematic
+		DungeonSchematic schematic = null;
+		schematic = loadAndValidateDungeon(dungeon, properties);
 		
 		// Register a new dimension
 		NewDimData parent = PocketManager.getDimensionData(link.source().getDimension());
@@ -174,17 +181,6 @@ public class PocketBuilder
 			return false;
 		}
 
-		DungeonData dungeon = null;
-		DungeonSchematic schematic = null;
-
-		dungeon = data;
-		if (data == null)
-		{
-			System.err.println("Could not select a dungeon for generation!");
-			return false;
-		}
-		schematic = loadAndValidateDungeon(dungeon, properties);
-
 		return PocketBuilder.buildDungeonPocket(dungeon, dimension, link, schematic, world, properties);
 	}
 

src/main/java/StevenDimDoors/mod_pocketDim/world/gateways/BaseGateway.java

@@ -73,7 +73,15 @@ public abstract class BaseGateway
 		this.generateRandomBits(world, x, y, z);
 		
 		DimLink link = PocketManager.getDimensionData(world).createLink(x, y + 1, z, LinkTypes.DUNGEON, orientation);
-		PocketBuilder.generateSelectedDungeonPocket(link, mod_pocketDim.properties, this.getStartingDungeon(PocketManager.getDimensionData(world),world.rand));
+		DungeonData dungeon = this.getStartingDungeon(PocketManager.getDimensionData(world), world.rand);
+		if (dungeon != null)
+		{
+			PocketBuilder.generateSelectedDungeonPocket(link, mod_pocketDim.properties, dungeon);
+		}
+		else
+		{
+			System.err.println("Warning: Dimensional Doors was unable to assign a dungeon to a Rift Gateway.");
+		}
 
 		return true;
 	}