The CauseThe crash cause was found to be a missing signal handler disconnect in the HTML view class. So with the object being finalized, the signal handler for network change events did trigger on an object that didn't exist anymore. Interestingly this only did crash Liferea on Fedora.
So the effect did only happen when you lost your network connection after closing a browser tab (e.g. by Wifi resconnect).
There are new Fedora packages for 1.8.8 FC17 and FC18. Please upgrade and retest! A new upstream release 1.8.9 will follow soon.