Dynamic meta data xano api error (no input value?)

Hi I am setting up the meta on dynamic collection pages but I am failing so looking for the help in the community.

I followed the exactly weweb doc. One thing I might suspect as reason is my Xano API which produces meta text returns 500 internal error.
Error is happening because there is no input value. I set up API so that there is page id as input so it makes sense that they give out error when there is no input. However, I don’t know how to solve this. Could anybody give help?