In state_flow_invoke_event_handlers (state_flow.module, line ~307), we call a node_load, then pass that $node object off on hook_state_flow_event_fired without first checking to see if the node exists in the first place. This has caused some issues with a project where we're working off of said node data.
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Comment #1
fmitchell commentedFixed in http://drupalcode.org/project/state_machine.git/commit/d37bd27