diff --git a/src/main/java/com/raoulvdberge/refinedstorage/block/BlockDiskDrive.java b/src/main/java/com/raoulvdberge/refinedstorage/block/BlockDiskDrive.java
index 41dc3feb0..cf49c3454 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/block/BlockDiskDrive.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/block/BlockDiskDrive.java
@@ -42,7 +42,15 @@ public class BlockDiskDrive extends BlockNode {
 
     @Override
     public IBlockState getExtendedState(IBlockState state, IBlockAccess world, BlockPos pos) {
-        return ((IExtendedBlockState) super.getExtendedState(state, world, pos)).withProperty(DISK_STATE, ((TileDiskDrive) world.getTileEntity(pos)).getDiskState());
+        IBlockState s = super.getExtendedState(state, world, pos);
+
+        TileEntity tile = world.getTileEntity(pos);
+
+        if (tile instanceof TileDiskDrive) {
+            s = ((IExtendedBlockState) s).withProperty(DISK_STATE, ((TileDiskDrive) tile).getDiskState());
+        }
+
+        return s;
     }
 
     @Override