Assert fails in QML BytecodeGenerator on INTEGRITY

Running a simple QML application causes assertion failure in qv4bytecodegenerator_p.h:
 
ASSERT: "generator->instructions[index].linkedLabel != -1" in file qtbase/include/QtQml/5.11.0/QtQml/private/../../../../../../../511/qtdeclarative/src/qml/compiler/qv4bytecodegenerator_p.h, line 107
        ~Jump() {
            Q_ASSERT(generator->instructions[index].linkedLabel != -1);
        }
 
Attached callstack and local variables when assert hits