/usr/bin/kate:6:qt_message_fatal:QMessageLogger::fatal:QXcbConnection::QXcbConnection:QXcbIntegration::QXcbIntegration:QXcbIntegrationPlugin::create

The Ubuntu Error Tracker has been receiving reports about a problem regarding kate. This problem was most recently seen with package version 4:17.04.3-0ubuntu1, the problem page at https://errors.ubuntu.com/problem/b597ce762cc9772b491be23637f77f4ff88ebf10 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.