Is it considered a sin to pray in one's shop alone when it is impossible to go to the mosque for fear of theft, bearing in mind that the questioner is from Iraq?

Attending congregational prayer in the mosque is obligatory for the able-bodied man who hears the call [to prayer]. It is not permissible for him to stay away from it except for a legitimate excuse. If it conflicts with opening the shop, he must close it, unless closing it would entail extraordinary hardship.