After update from Debian Stretch to Buster I cannot open links from applications

I recently updated from Debian Stretch to Buster. I first got aware I cannot open links from inside Rambox. I addressed an issue on GitHub but now I found out I cannot open links from inside PHPStorm and any other application either. I always get the following error message in a dialog box

-------------------- Error --------------------

 (-) /home/johndoe/https:/example.com/path/to/
     resource.php: No such file or directory

                                        [ Ok ]

As one can see there's always the path to my home directory placed in front of the link. I won't reinstall my system as a whole. --- **Edit (2019-08-18):** While it's an issue of the Desktop Environment I forgot to mention I'm using LXDE. --- **Edit (2019-08-19):** I found xdg-open which leads to the same error.

xdg-open https://example.com