itch.io

Try setting your shop to 'open'? Look at the inside of the front door to your shop.

I had this bug occur to me too; reloading the game made him disappear.

I've had this problem too and if you haven't found a temporary solution already, I've found that if you bring a weapon just out of the front door they will come and grab it if its the weapon they want, if not bring a different type of weapon out until theytake it and leave then the next customer will come