Crash on saving debug message content to file in WD

0. Launch UGENE with closed project view (i.e. if you have project view usually opened then close it and restart UGENE)
1. Create (not load from file) some valid quite long running scheme in WD
2. Place a breakpoint on some element
3. Run the scheme
Expected state: breakpoint has to trigger, workflow scene has appeared
4. Choose some workflow channel containing messages by left mouse button
Expected state: the table with intermediate data has appeared
5. Call the context menu on some table's item, choose the "Convert to document" item
Expected state: UGENE does not crash, the "Export document" dialog has appeared