Hey, I can think of two solutions here
you want the user to be redirected from homepage only once
To accomplish this, you’ll need to add a flag in the browser once a redirect happens.
you have put the Javascript code on all pages and now your catalog page is getting redirected to itself?
To overcome this, you just need to include the Javascript code on the homepage which will fix your catalog page getting redirected to itself.
Let me know if you want the first solution, I’ll revise the code to accomplish the solution.