public boolean tryUseItem(EntityPlayer p_73085_1_, World p_73085_2_, ItemStack p_73085_3_)
{
    int i = p_73085_3_.stackSize;
    int j = p_73085_3_.getItemDamage();
    ItemStack itemstack1 = p_73085_3_.useItemRightClick(p_73085_2_, p_73085_1_); 
    /*^== item/magic/ItemPrincessClam#152 returns null so itemstack1 is now unusable */

    if (itemstack1 == p_73085_3_ && (itemstack1 == null || itemstack1.stackSize == i
    && itemstack1.getMaxItemUseDuration() <= 0 && itemstack1.getItemDamage() == j))
    {
        return false;
    }
    else {
        p_73085_1_.inventory.mainInventory[p_73085_1_.inventory.currentItem] = itemstack1;
        if (this.isCreative()) {
            itemstack1.stackSize = i; 
            /*^== trying to change a null - crash! */
            if (itemstack1.isItemStackDamageable())
            {
                itemstack1.setItemDamage(j);
            }
        }

        if (itemstack1.stackSize == 0)
        {
[...]