PrototypeChainCycle confuses Qt Design Studio project storage

Component {
        file: "private/qqmlvaluetype_p.h"
        name: "QEasingCurve"
        accessSemantics: "value"
        extension: "QQmlEasingValueType"

    Component {
        file: "private/qqmlvaluetype_p.h"
        name: "QQmlEasingValueType"
        accessSemantics: "value"
        prototype: "QEasingCurve"

throw PrototypeChainCycle{};