Answer: Annoying warnings “Debug session was finished without being paused” in PhpStorm with Vagrant and Xdebug

It would do this if there are no breakpoints being hit when debugging the script. The "break at first line" probably prevents PhpStorm from issuing you the warning, but otherwise it does exactly the same.

In case you do have breakpoints configured, and PhpStorm doesn't stop on them, then it…