Crash when adding first and second time bar markings with only a simple barline between them

Action
1. Add a first-time bar marking to bar 2 of attached score.
2. Add a second-time bar marking to bar 3.

Result
- Crash

Note: See File 1.
Note. For correct syntax, there should be a repeat-bar after the first-time bar. However, the user should be able to create incorrect syntax without a crash happening.

Note.
To make the crash go away, in another part of the score: (1) Create a repeat bar (2) Add the first and second time bar marking on either side. THEN do the actions as above. —The crash does not occur. See File 2.