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Maybe you can catch it with GlobalCEFApp.OnUncaughtException but that event is executed in the render process and you also have to set GlobalCEFApp.UncaughtExceptionStackSize to any value bigger than zero to enable that event.
///
// Called for global uncaught exceptions in a frame. Execution of this
// callback is disabled by default. To enable set
// CefSettings.uncaught_exception_stack_size > 0.
///