Merge commit '8b5161c2aed8637de9bffb1d81298d60ea237caf' * commit '8b5161c2aed8637de9bffb1d81298d60ea237caf': An attempt to unregister a handler that's no longer registered should not cause an assertion.
Merge commit '8b5161c2aed8637de9bffb1d81298d60ea237caf' * commit '8b5161c2aed8637de9bffb1d81298d60ea237caf': An attempt to unregister a handler that's no longer registered should not cause an assertion.