Hello I am a web developer, I designed a program. (individually) and I want to sell publicly. Since there is never 100% security and there may be a bug in a program I wrote. I wanted to see, for example, someone buys the program from me and after 6 months or a year, his website has problems. Can he sue me?

Hello
I am a web developer, I designed a program. (individually) and I want to sell publicly. Since there is never 100% security and there may be a bug in a program I wrote.
I wanted to see, for example, someone buys the program from me and after 6 months or a year, his website has problems. Can he sue me?