Open command causes loop in function

Question

I am writing a bash script on my mac and when I call a function with the open command it gets stuck in a loop.

For example:

function (){
   open https://www.example.com
}

I have tried putting some echo commands in between the open command to see what happens.

If I do the following:

function (){
   echo "checkpoint 1"
   open https://www.example.com
   echo "checkpoint 2"
}

I get the following output:

checkpoint 1
checkpoint 1
checkpoint 1
checkpoint 1...

If I isolate the command outside of the function then the script behaves as expected.

Any help is greatly appreciated.