Tenant signed lease but wont pay deposit

[Joseph Weisenbloom]

Recently a perspective tenant found a loophole in my lease after it was signed. It states that the deposit will be "paid before move in" To this effect the tenant could pay the day before move in leaving me waiting weeks with the threat of them backing out at the last minute. 

Is this lease valid without receiving a deposit? Or can I cancel? Im a little concerned as finding a lease loophole isn't the ideal way of starting a rental relationship. I have used this lease for 7 year without running into this issue. Most people want to secure the rental with a deposit in advance.

What do you guys think?