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<@U5TNEF7FW> no issue with the fieldChange firing as I said, I know why that would happen, I have removed the log.debug lines but that's not really answering why it works in SB and not Prod :wink:

generally unexpected error means something went wrong

if i had to guess, you are either logging something invalid or netsuite is confused about where it needs to put the log

recreate whatever process you used to put the client script on your record

since you have a sandbox and it works in production, an overreaction might be to refresh the sandbox