diff --git a/core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataFileHandler.java b/core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataFileHandler.java
index ee94e10dd..b73819b03 100644
--- a/core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataFileHandler.java
+++ b/core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataFileHandler.java
@@ -71,8 +71,9 @@ public class GeneratedFullDataFileHandler extends FullDataFileHandler
 		IFullDataSource dataSource = super.get(pos);
 		
 		// add world gen tasks for missing columns in the data source
+		// if this position hasn't already been queued for generation
 		IWorldGenerationQueue worldGenQueue = this.worldGenQueueRef.get();
-		if (worldGenQueue != null)
+		if (worldGenQueue != null && !this.generatingDataSourceByPos.containsKey(pos))
 		{
 			this.queueWorldGenForMissingColumnsInDataSource(worldGenQueue, pos, dataSource);
 		}