openshot crashes when red-time-line vertical bar is not located at 00:00:00

TEST CASE

- add some content to a track

- move the vertical red-time-line indicator over the content

- right click the content and select preferences

- make a change to the preferences, such as reduce its length

- save changes

RESULT

at some point after selecting preferences OpenShot will crash but you may not get as far as saving changes

this test case is a reliable way of crashing OpenShot for me but crashes occur often when the vertical red-time-line indicator is not set to 00:00:00

WORK-AROUND

move the vertical red-time-line indicator to 00:00:00 before making any changes to content but this makes OpenShot very laborious to use.