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Incorrect check for null when the function "buildResolverTree" is executed

3

### Description An error occurs when trying to get a non-existent value: `Object reference not set to an instance of an object.` ### Repro steps 1. Run the query for...

For optional fields, there is no constraint of type "null"

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# Bug Report **Current behavior** There is no possibility of setting the value "null" for arguments because of the restrictions on types **Reproduction** _Scheme_ ```gql type User { id: ID!...