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Yes that's the thing that let's Kali (and most pen testing distros down, stability) there are fixes for a lot of issues already out there so have a search through the Kali forums. Just FYI I wouldn't really recommend this as a daily OS for that reason.

I was using uniscan on Kali to test on my site and suddenly it crashed I was like what the fuck, I might change it

Did you receive any errors? was it uniscan that crashed or Kali itself. When something like this happens it's important to be as detailed as you possibly can. Post the contents of any log files mentioned (obviously remove any IP addresses or other identifying information) exactly what you did and any output. This way we can help you a lot more efficiently rather then asking for details or providing solutions that are irrelevant.