We're hitting a release assertion in PolicyCheckIdentifier::isValidFor when WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction fails to send a sync IPC.
<rdar://problem/47941089>
Created attachment 361895 [details] Fixes the bug
Comment on attachment 361895 [details] Fixes the bug Clearing flags on attachment: 361895 Committed r241352: <https://trac.webkit.org/changeset/241352>
All reviewed patches have been landed. Closing bug.
Not even a PSON bug :P