Fixed Bug: #1091 - Crash with Interface

- Also formatted Changes.

me/storage/MEMonitorIInventory.java

@@ -3,8 +3,8 @@ package appeng.me.storage;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedList;
-import java.util.NavigableMap;
 import java.util.Map.Entry;
+import java.util.NavigableMap;
 import java.util.TreeMap;
 
 import net.minecraft.item.ItemStack;
@@ -30,7 +30,8 @@ public class MEMonitorIInventory implements IMEInventory<IAEItemStack>, IMEMonit
 	class CachedItemStack
 	{
 
-		public CachedItemStack(ItemStack is) {
+		public CachedItemStack(ItemStack is)
+		{
 			if ( is == null )
 			{
 				itemStack = null;
@@ -68,7 +69,8 @@ public class MEMonitorIInventory implements IMEInventory<IAEItemStack>, IMEMonit
 		listeners.remove( l );
 	}
 
-	public MEMonitorIInventory(InventoryAdaptor adaptor) {
+	public MEMonitorIInventory(InventoryAdaptor adaptor)
+	{
 		this.adaptor = adaptor;
 		memory = new TreeMap();
 	}
@@ -222,18 +224,21 @@ public class MEMonitorIInventory implements IMEInventory<IAEItemStack>, IMEMonit
 		}
 
 		// detect dropped items; should fix non IISided Inventory Changes.
-	 	NavigableMap<Integer,CachedItemStack> end = memory.tailMap( high, false );
-	 	if ( ! end.isEmpty() )
-	 	{
-			for ( CachedItemStack cis : end.values() )
+		NavigableMap<Integer, CachedItemStack> end = memory.tailMap( high, false );
+		if ( !end.isEmpty() )
+		{
+			for (CachedItemStack cis : end.values())
 			{
-				IAEItemStack a = cis.aeStack.copy();
-				a.setStackSize( - a.getStackSize() );
-				changes.add( a );
-				changed = true;
+				if ( cis != null )
+				{
+					IAEItemStack a = cis.aeStack.copy();
+					a.setStackSize( -a.getStackSize() );
+					changes.add( a );
+					changed = true;
+				}
 			}
 			end.clear();
-	 	}
+		}
 
 		if ( !changes.isEmpty() )
 			postDiffrence( changes );