- Add condition to ensure doer isn't nil when using it.
- Added unit test.
- Resolves#2055
(cherry picked from commit 8f1a74fb29)
(cherry picked from commit 60ac881776)
(cherry picked from commit 5fdc461ac5)
(cherry picked from commit 70623e8da1)
(cherry picked from commit 1d5153aaf6)
(cherry picked from commit 3927f0c8b2)