check if request.session.data is a getter or object

[Gradlon]

Checklist

• [ ] run npm run test and npm run benchmark
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message and code follows the Developer's Certification of Origin and the Code of conduct

I did not yet find time to run the test. What I added is a check if the request.session.data is a setter or object, since when using with nestjs it is implemented as a getter I ran into problems.