CppEditor: Crash on closing modified file

Not sure if reproducible at all.. But here's what I did:

• open a project under version control
• change something + make a commit
• switch to console and checkout a different patch
• switch back to QC
  • dialog comes up regarding changed files - hit "Yes, reload All"
• click the close button of the file (the 'X' between the file's name and its outline)

See attached backtrace for more information (crash happened in Thread 1)

Notes: I'm pretty sure that cpp indexing was done already (AutoTest had started to scan for tests), and ClangCodeModel is not involved..