Openshot crashes when exporting video on 20.04

OpenShot (version 2.4.3) crashes when it is exporting a video (YouTube HD 720p 30fps). I installed it using apt and official repos. This is the last part of the log file:

 export:INFO YouTube-HD export:INFO None export:INFO None export:INFO /usr/lib/python3/dist-packages/openshot_qt/profiles/atsc_1080p_2398 export:INFO /usr/lib/python3/dist-packages/openshot_qt/profiles/atsc_1080p_2398 export:INFO Low export:INFO Med export:INFO Valid framerate detected, sending to libopenshot: 23.976023976023978 export:INFO /usr/lib/python3/dist-packages/openshot_qt/profiles/atsc_720p_30 export:INFO /usr/lib/python3/dist-packages/openshot_qt/profiles/atsc_720p_30 export:INFO Valid framerate detected, sending to libopenshot: 30.0 export:INFO High export:INFO /home/lorenrookie/Escritorio/prueba.mp4 logger:ERROR /usr/lib/python3/dist-packages/openshot_qt/windows/main_window.py:2226: PyGIWarning: Unity was imported without specifying a version first. Use gi.require_version('Unity', '7.0') before import to ensure that the right version gets loaded. logger:ERROR from gi.repository import Unity

main_window:INFO auto_save_project main_window:INFO Creating backup of project file: /home/lorenrookie/.openshot_qt/backup/backup.osp main_window:INFO auto_save_project

Any idea?

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