Application tester re-run fails with OS error [Errno 98] Address already in use

[xoriole]

Running application tester immediately after the previous run was terminated results in an OS error [Errno 98] Address already in use.

[tribler-gui PID:922794] 2024-01-23 16:59:58,364 - ERROR <start_gui:86> tribler.gui.start_gui.run_gui(): Tribler configuration conflicts with the current OS state: REST API port 20100 already in use
Traceback (most recent call last):
  File "/home/user/tribler/src/tribler/gui/start_gui.py", line 77, in run_gui
    window = TriblerWindow(process_manager, app_manager, settings, root_state_dir,
  File "/home/user/tribler/src/tribler/gui/tribler_window.py", line 167, in __init__
    raise RuntimeError(
RuntimeError: Tribler configuration conflicts with the current OS state: REST API port 20100 already in use
********************************************************************************
Tribler Exception
********************************************************************************
RuntimeError: Tribler configuration conflicts with the current OS state: REST API port 20100 already in use
********************************************************************************
ERROR - Executor(125): Tribler process terminated suddenly. Code: 1
ERROR - Executor(103): Tribler process finished unexpectedly with the return code 1

Operating System: Ubuntu 22.04
Branch: main