diff --git a/src/main/java/appeng/util/item/OreHelper.java b/src/main/java/appeng/util/item/OreHelper.java
index 5ed8517bf..1f8bc0922 100644
--- a/src/main/java/appeng/util/item/OreHelper.java
+++ b/src/main/java/appeng/util/item/OreHelper.java
@@ -76,8 +76,8 @@ public class OreHelper
 
 			for ( String ore : OreDictionary.getOreNames() )
 			{
-				// skip ore if it is a match already.
-				if ( toAdd.contains( ore ) )
+				// skip ore if it is a match already or null.
+				if ( ore == null || toAdd.contains( ore ) )
 				{
 					continue;
 				}