The question is asking about an issue related to Vaadin and Spring Boot where logging out results in a null pointer exception due to VaadinServletResponse being null.

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Possible solutions to this issue could include upgrading to a newer version of Vaadin or Spring Boot, ensuring that all necessary dependencies are correctly included and configured, checking for any conflicts or overlap in libraries, and reviewing the logout code to ensure it is properly handling the VaadinServletResponse. It may also be helpful to consult the Vaadin and Spring Boot documentation or community forums for further assistance.