(difficulty: easy, requires the ability to install the Moodle database using the CLI comand) Prepare the test environment You can use the Moodle Docker Toolbox, by selecting any DB - the fastest in your setup: # export MOODLE_DOCKER_WWWROOT=/path/to/moodle/branch # export MOODLE_DOCKER_DB=mysql Before applying the fix Start the environment: # bin/moodle-docker-compose up -d Install the database using the Moodle CLI; a notice will be printed: # bin/moodle-docker-compose exec webserver php admin/cli/install_database.php --agree-license --fullname="Docker moodle" --shortname="docker_moodle" --adminpass="test" --adminemail="admin@example.com"   Notice: Undefined property: stdClass::$branch in /var/www/html/lib/classes/plugin_manager.php on line 755 ------------------------------------------------------------------------------- == Setting up database == -->System ++ Success ++ [...] -->logstore_standard ++ Success ++ Installation completed successfully. Stop the environment, trashing it: # bin/moodle-docker-compose down -v After applying the fix Start the environment: # bin/moodle-docker-compose up -d Install the database using the Moodle CLI; no notice will be printed: # bin/moodle-docker-compose exec webserver php admin/cli/install_database.php --agree-license --fullname="Docker moodle" --shortname="docker_moodle" --adminpass="test" --adminemail="admin@example.com" ------------------------------------------------------------------------------- == Setting up database == -->System ++ Success ++ [...] -->logstore_standard ++ Success ++ Installation completed successfully. Stop the environment, trashing it: # bin/moodle-docker-compose down -v