Thanks for posting this, we'll take a look. In the future, it is easiest for us if you go to Steam->Help->System Information, scroll to the end, and copy / paste the "Recent Failure Reports" list. This list will include the crash ids, which we can use to look up what caused the crash.
Have you seen consistent crashes?
Closing as this does not appear to be active.
Nothing extracted yet.
See https://github.com/sorokin/steam-crash for minidump.