QtWebAssembly: Uncaught exception when using QWebSocket::sendBinaryMessage() with threaded application

qwidget-login-test.worker.js:165 worker.js onmessage() captured an uncaught exception: TypeError: caller is not a function
onmessage @ qwidget-login-test.worker.js:165
qwidget-login-test.worker.js:166 TypeError: caller is not a function
at __emval_call_void_method (blob:http://localhost:30000/50e9e32f-cbb2-4c6f-b9ff-4b7f756d8de3:7646:7)
at QWebSocketPrivate::sendBinaryMessage(QByteArray const&) (qwidget-login-test.wasm)
at QWebSocket::sendBinaryMessage(QByteArray const&) (qwidget-login-test.wasm)
at CtiLib::sendRequest(QString const&, bool) (qwidget-login-test.wasm)
at CtiLib::sendAuth() (qwidget-login-test.wasm)
at CtiLib::handleConnection() (qwidget-login-test.wasm)
at QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (CtiLib::*)()>::call(void (CtiLib::*)(), CtiLib*, void**) (qwidget-login-test.wasm)
at void QtPrivate::FunctionPointer<void (CtiLib::*)()>::call<QtPrivate::List<>, void>(void (CtiLib::*)(), CtiLib*, void**) (qwidget-login-test.wasm)
at QtPrivate::QSlotObject<void (CtiLib::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qwidget-login-test.wasm)
at QMetaCallEvent::placeMetaCall(QObject*) (qwidget-login-test.wasm)
onmessage @ qwidget-login-test.worker.js:166
qtloader.js:382 pthread sent an error! http://localhost:30000/qwidget-login-test.worker.js:167: Uncaught [object MessageEvent]
qwidget-login-test.worker.js:167 Uncaught MessageEvent