GWT 2.8 Migration RPC failure - undefined tokens

Hi all,

After migrating to GWT 2.8, our project some of our RPC's seem to be failing during deserialization with 'undefined' members within the token list, ex: "203f-d320-6bd3-996b-dec5-99de-d899-53d8, 1, 2, 3, 4, 2, 5, 6, 7, undefined, 15, 6, 2017".
Strangely, some RPC calls do work and do not have undefined values passed along to the server.

Any insight into the issue would be great.

thanks,

Tyler

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