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[Khris]

Say your inventory item is called iYellowStone.
You can do this:

Code: ags

  if (player.InventoryQuantity[iYellowStone.ID] == 0) player.AddInventory(iYellowStone);

Since this is a bit technical, a new function was added some time ago: Character.HasInventory.

Code: ags

  if (!player.HasInventory(iYellowStone)) player.AddInventory(iYellowStone);

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[Khris]

I just noticed you can also do this:

Code: ags

  player.InventoryQuantity[iYellowStone.ID] = 1;

The only difference is that setting it directly won't trigger the "inventory was added" event, but I figure you won't need it here anyway, if you're even using it.