diff --git a/core/Registration.java b/core/Registration.java
index 6401a32e8..2b0d42396 100644
--- a/core/Registration.java
+++ b/core/Registration.java
@@ -209,12 +209,17 @@ public class Registration
 		{
 			try
 			{
-				Field f = materialClass.getField( "material" + mat.name() );
-				ItemStackSrc is = ((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
-				if ( is != null )
-					f.set( materials, new DamagedItemDefinition( is ) );
+				if ( mat == MaterialType.InvalidType )
+					((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
 				else
-					f.set( materials, new NullItemDefinition() );
+				{
+					Field f = materialClass.getField( "material" + mat.name() );
+					ItemStackSrc is = ((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
+					if ( is != null )
+						f.set( materials, new DamagedItemDefinition( is ) );
+					else
+						f.set( materials, new NullItemDefinition() );
+				}
 			}
 			catch (Throwable err)
 			{
@@ -230,30 +235,35 @@ public class Registration
 		{
 			try
 			{
-				Field f = partClass.getField( "part" + type.name() );
-				Enum varients[] = type.getVarients();
-				if ( varients == null )
-				{
-					ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, null );
-					if ( is != null )
-						f.set( parts, new DamagedItemDefinition( is ) );
-					else
-						f.set( parts, new NullItemDefinition() );
-				}
+				if ( type == PartType.InvalidType )
+					((ItemMultiPart) partItem.item()).createPart( type, null );
 				else
 				{
-					if ( varients[0] instanceof AEColor )
+					Field f = partClass.getField( "part" + type.name() );
+					Enum varients[] = type.getVarients();
+					if ( varients == null )
 					{
-						ColoredItemDefinition def = new ColoredItemDefinition();
-
-						for (Enum v : varients)
+						ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, null );
+						if ( is != null )
+							f.set( parts, new DamagedItemDefinition( is ) );
+						else
+							f.set( parts, new NullItemDefinition() );
+					}
+					else
+					{
+						if ( varients[0] instanceof AEColor )
 						{
-							ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, v );
-							if ( is != null )
-								def.add( (AEColor) v, is );
-						}
+							ColoredItemDefinition def = new ColoredItemDefinition();
 
-						f.set( parts, def );
+							for (Enum v : varients)
+							{
+								ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, v );
+								if ( is != null )
+									def.add( (AEColor) v, is );
+							}
+
+							f.set( parts, def );
+						}
 					}
 				}
 			}
diff --git a/items/materials/ItemMultiMaterial.java b/items/materials/ItemMultiMaterial.java
index dd11c3428..5fe0a45aa 100644
--- a/items/materials/ItemMultiMaterial.java
+++ b/items/materials/ItemMultiMaterial.java
@@ -166,7 +166,7 @@ public class ItemMultiMaterial extends AEBaseItem implements IStorageComponent,
 	{
 		if ( dmgToMaterial.containsKey( is.getItemDamage() ) )
 			return dmgToMaterial.get( is.getItemDamage() );
-		return null;
+		return MaterialType.InvalidType;
 	}
 
 	@Override
diff --git a/items/materials/MaterialType.java b/items/materials/MaterialType.java
index af1a9acf5..4cd82688c 100644
--- a/items/materials/MaterialType.java
+++ b/items/materials/MaterialType.java
@@ -17,6 +17,8 @@ import cpw.mods.fml.relauncher.SideOnly;
 
 public enum MaterialType
 {
+	InvalidType(-1, AEFeature.Core),
+
 	CertusQuartzCrystal(0, AEFeature.Core, "crystalCertusQuartz"), CertusQuartzCrystalCharged(1, AEFeature.Core, EntityChargedQuartz.class),
 
 	CertusQuartzDust(2, AEFeature.Core, "dustCertusQuartz"), NetherQuartzDust(3, AEFeature.Core, "dustNetherQuartz"), Flour(4, AEFeature.Flour, "dustWheat"), GoldDust(
diff --git a/items/parts/PartType.java b/items/parts/PartType.java
index 5a17dbebd..503401f8c 100644
--- a/items/parts/PartType.java
+++ b/items/parts/PartType.java
@@ -39,6 +39,8 @@ import appeng.parts.reporting.PartTerminal;
 
 public enum PartType
 {
+	InvalidType(-1, AEFeature.Core, null),
+
 	CableGlass(0, AEFeature.Core, PartCableGlass.class),
 
 	CableCovered(20, AEFeature.Core, PartCableCovered.class),