only fire simulation if a player requested it

src/main/java/appeng/crafting/CraftingJob.java

@@ -174,6 +174,8 @@ public class CraftingJob implements Runnable, ICraftingJob
 				this.simulate = true;
 
 				try
+				{
+					if( actionSrc.player().isPresent() )
 					{
 						final Stopwatch timer = Stopwatch.createStarted();
 						final MECraftingInventory craftingInventory = new MECraftingInventory( this.original, true, false, true );
@@ -193,6 +195,7 @@ public class CraftingJob implements Runnable, ICraftingJob
 
 						this.logCraftingJob( "simulate", timer );
 					}
+				}
 				catch( final CraftBranchFailure e1 )
 				{
 					AELog.debug( e1 );