CHICAGO (CBS)–  Chicago police are warning anyone using dating apps to be careful after four robberies took place in the last month.

In each attack the victim went to meet-up with someone, who would use a stun gun on them before robbing them.

One of those attacks involved a 60-year-old man meeting another man at the Cambria Hotel in the Loop earlier this month.

The man tried to run off with the victim’s wallet, but police were able to find and arrest him.