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SpringBoot 2.0.1 vs SpringBoot 2.0.0 (Kotlin)

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When I first created this code and ran it against SpringBoot 2.0.0 it worked correctly.
However with SpringBoot 2.0.1 the code breaks on The error message that I get is "block()/blockFirst()/blockLast() are blocking, which is not supported in thread/operation"

This issue is explained here
But the solution provided does not help me too much at this point as I would like to get the string value for the posted form element "firstName" and I'm not using the WebClient as far as I know.

Do you have any thoughts on how I can unwrap the form element so that I can get a String value and not a Mono<List<String>> value?
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