项目中用到了QtWebengine渲染H5页面，开发过程中，经常有同事的机器上出现崩溃，且该崩溃一旦出现，就会反复出现，但在release下却不崩溃。
崩溃时，会在调试信息输出窗口打印如下错误信息：

[0726/175055:FATAL:url_request.cc(570)] Check failed: !job_.get().

Backtrace:

GetHandleVerifier [0x12091731+277617]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11FE440F+3060911]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x11514179+13748857]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x1166BF40+15157312]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x1156F887+14123399]

QtWebEngineCore::BrowserContextAdapter::isOffTheRecord [0x118A9319+1522889]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x1116421C+9882396]

QtWebEngineCore::JavaScriptDialogController::type [0x1079F6BA+46314]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x1122E35C+10710108]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11F12A91+2202417]

QtWebEngineCore::JavaScriptDialogController::type [0x107A0158+49032]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11D5FFFF+422047]

GetHandleVerifier [0x120ADC3D+393597]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11FF39D8+3123832]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11FF20A4+3117380]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11FF25ED+3118733]

GetHandleVerifier [0x120B03E2+403746]

GetHandleVerifier [0x120B1E82+410562]

GetHandleVerifier [0x120B1DEC+410412]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11FF37E7+3123335]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x12023016+3317942]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x11FF369D+3123005]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x12039C66+3411206]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x10C71624+4693796]

QtWebEngineCore::FilePickerController::qt_static_metacall [0x10C7243B+4697403]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x1203A769+3414025]

QEnableSharedFromThis<QtWebEngineCore::WebContentsAdapter>::operator= [0x120414F6+3442070]

BaseThreadInitThunk [0x762B343D+18]

RtlInitializeExceptionChain [0x77AD9832+99]

RtlInitializeExceptionChain [0x77AD9805+54]

解决办法：删除QtWebengine在本地的缓存。

缓存文件地址：C:\Users\Administrator\AppData\Local\efztoon（应用程序的exe文件名称）