No weapon in the Shop bug

[pickysource]

I picked up the item that something like "You have a chance to buy a weapon for free"
and then I tried to buy a middle crystal blaster something which was 6 coin. At that moment, I only had 4-5 coins so the price text was in red (which means you can't buy). I knew I wouldn't be able to buy that gun. However, when I clicked the gun, I got the gun for free. I thought "well that's the item I just picked up maybe?"
Anyway, the game goes on and on, I stepped into the next shop. and there was NO GUN AT ALL. I thought "well, I probably picked up no gun in this stage artefact."
and then next stage, no gun.
and then next stage, no gun.
After I bought the first gun for free (probably it was the second stage),
I double checked the artefact of course because I wanted to upgrade my gun so much
and I had so much gold.
Until I killed the last boss (the bear), there was no gun in the shop.
After I looped, finally I could see weapons in a shop (obviously it's too late)

Anyway,
After I bought a weapon for free and I could not buy any weapon till I looped.
Don't tell me "Haven't you pick up No Weapon Artefact?" Of course No.

[Applava]

Hi,

When you don't have enough coins, you can steal a weapon from the shop. You can see a thief icon over the gun when you step on the tile having not enough coins for that weapon. So basically, you did not get it for free, you stole it. And as you noticed, stealing has negative consequences (no weapons in the shop till loop). So players should think twice before stealing because of the downside of no weapons in further shops.

The item which gives a chance that you will not be charged for a weapon purchase can work only for "legal" purchases (when you have enough money for that weapon).

[pickysource]

Oh thanks! which means, I can steal any weapon I want before the loop!