cullmann added a comment.
Before we got to excessive solutions, I assume you have a build were you can reproduce the crashs. If you add to your version the line: qputenv("QV4_FORCE_INTERPRETER", QByteArrayLiteral("1")); into KTextEditor::EditorPrivate::EditorPrivate constructor in kateglobal.cpp, does that solve the crashs for you? If that works one could add that there with some dynamic check with qVersion() inside a #if QT_VERSION < QT_VERSION_CHECK(5, 9, 1) block. REPOSITORY R39 KTextEditor REVISION DETAIL https://phabricator.kde.org/D8544 To: rjvbb, #frameworks Cc: cullmann, kde-frameworks-devel, kevinapavew, demsking, head7, kfunk, sars, dhaumann