Qt Creator crashes due to CppTools plugin problem

After upgrade MacOS to Catalina 10.15.4: When starting Qt Creator the message "It looks like Qt Creator closed because of a problem with the CppTool plugin" pops up.

Disabling the plugin: Unable to work with the Creator.
Enabling the plugin: Crash 

See part of problem report below.
I removed and reinstalled Qt 5.14.2 complete but problem persists.

Kind regards
Frans Meerhoff

Thread 0 Crashed:: Dispatch queue: com.apple.main-threadThread 0 Crashed:: Dispatch queue: com.apple.main-thread0   libCppTools.dylib              0x00000001150cc294 QVector<CppTools::ClangDiagnosticConfig>::QVector(QVector<CppTools::ClangDiagnosticConfig> const&) + 201   libCppTools.dylib              0x00000001150f1c52 CppTools::CppCodeModelSettings::clangCustomDiagnosticConfigs() const + 182   libCppTools.dylib              0x000000011517509a CppTools::diagnosticConfigsModel() + 423   libCppTools.dylib              0x00000001150f157a CppTools::CppCodeModelSettings::toSettings(QSettings*) + 1544   libCppTools.dylib              0x00000001150f087f CppTools::CppCodeModelSettings::fromSettings(QSettings*) + 44475   libCppTools.dylib              0x0000000115171dc3 CppTools::Internal::CppToolsPluginPrivate::CppToolsPluginPrivate() + 2916   libCppTools.dylib              0x000000011516bc7a CppTools::Internal::CppToolsPlugin::initialize(QStringList const&, QString*) + 587   libExtensionSystem.4.12.0.dylib 0x000000010ec293eb ExtensionSystem::Internal::PluginSpecPrivate::initializePlugin() + 1078   libExtensionSystem.4.12.0.dylib 0x000000010ec19aa7 E