Question Best way to dropping?

ForEach is better way to Dropping items?

Actually I'm using a code like this below and the bot stills undropping some items.

Code (Text):

1.  
2. for (SpriteItem x : Inventory.getItems()){
3.  
4.     if (x != null){
5.  
6.         if (x.interact("Drop")){
7.  
8.             Execution.delayUntil(() -> !x.isValid(), 1200);
9.         }
10.     }
11. }
12.  

Has another way more efficiently to drop items or could this iteration wrong?