try/catch doesn't work

[wzup]

Use case. The goal is to stop code execution that follows try/catch, if the try/catch has an error. But it executes.

let urls = ["url", "url", "url"]
co(function* () {

    let promises = urls.map(url => {
        return request_promise(url);
    })

    // so x is an array with results from request
    let x = yield promises; // x[]

   // suppose if JSON.parse(x) throws an error
   let j;
    try {
        j = JSON.parse(x);
    }
    catch(e) {
        // HOW DO I PASS THIS ERROR ON to .catch() block of this generator?
        // the code below this try/catch doesn't have to be executed and .then block doesn't have to called
        ???
    }
    
   // I have code here too
   // And I don't want it to execute if try/catch throws an error
   // but it however executes
   ... do some stuff with x
   return { some_result: foo };
})
.then(result => {
    // this block shouldn't execute it try/catch has error, but it does. why?
    res.send(200).json(result)
})
.catch(err => {
   // the error from try/catch has to be passed on here
   res.send(500).json({err: err})
})

[freiit]

Do I oversee something here?
The normal JS behavior: If you "catch" an exception, it is resolved and normal execution goes on.
Just add another "throw e" in your "catch" block or don't "try/catch" at all.
Does this help?