1) Open a few xfce4-terminal windows 2) execute something like `xfce4-terminal -e asdf` A dialog appears with the message "Failed to execute child process "asdf" (No such file or directory)" then after a second or so, all of the xfce4-terminal windows suddenly close. I would expect a bad execute command to not crash the entire xfce4-terminal session. If you use the --disable-server flag in the above command, only the newly opened window closes and the original ones (from step 1) remain functional.
Igor referenced this bugreport in commit 6f321bd100be25da9ea1ed3a65e9d41f38676427 Fix app crash when running a non-existing command https://git.xfce.org/apps/xfce4-terminal/commit?id=6f321bd100be25da9ea1ed3a65e9d41f38676427
Thanks a lot for your report! The bug has been fixed with the commit referenced above.
*** Bug 14306 has been marked as a duplicate of this bug. ***