* commit '5a812d4e6986e71121b6f8374e51b3ea5ef076ae': Adding additional null checks to prevent crash after task stack view callback is reset. (Bug 18376798)
* commit '5a812d4e6986e71121b6f8374e51b3ea5ef076ae': Adding additional null checks to prevent crash after task stack view callback is reset. (Bug 18376798)