You are looping through this JArray to try to find the first JObject having a name property with a certain value, and when you find it you attempt to replace the JObject with a whole new JObject. I was able to reproduce your problem here: What is going wrongĪdditionalFields refers to the JArray of JObjects containing name and value JProperties. I can see in the debugger that the token has been removed (as the token.Count is reduced by 1) so cannot understand why I'm getting an error adding the replacement token. However after adding the token I'm getting the following error Var updatedToken = CreateNewToken('newname', 'newvalue') ĪdditionalFields.AddAfterSelf(updatedToken) <- error occurs here!! If (string.Equals((), 'newname', StringComparison.CurrentCultureIgnoreCase)) Putting it all together we have the following foreach (var additionalField in additionalFields)

The data is an array of JTokens with a parent called 'additionalFields' as follows: ' I have the following structure of additional information where I need to update the value of one of the tokens in the structure.

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