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Fix NPE when slot in chest is empty
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@ -226,7 +226,7 @@ public class InventoryUtil {
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for (int currentSlot = 0; currentSlot < effectiveSize(inventory) && amountLeft > 0; currentSlot++) {
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ItemStack currentItem = inventory.getItem(currentSlot);
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if (MaterialUtil.equals(currentItem, item)) {
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if (currentItem != null && MaterialUtil.equals(currentItem, item)) {
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int neededToRemove = Math.min(currentItem.getAmount(), amountLeft);
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currentItem.setAmount(currentItem.getAmount() - neededToRemove);
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