How to stop crickets from breeding?

The crickets I bought for my gecko have started multiping, how do I get them to stop as fast as possible. I am affraid that this will cause problems for my leopard gecko

Edit: okay so I was panicing when I was writing this and I am back to explain it further. They are in a seperate container but somehow they got out of it. Some of those crickets looked like they were going to lay eggs. I just want to discourage them from making more before I find all of the crickets that got out. I am very scared that these will somehow get in my geckos terrarium and hurt him, but reading this I realised this is more of my problem than my geckos