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Aubrey:
I have both good and bad news

The good is I think I found the cause for this error, *I think* it is related to Module Caching in XOOPS template engine (Smarty), so if you disable caching, it may just go away.
The bad news is I still don't know how to fix it,

but I'm currently looking at it.
I'm looking to confirm if this is the cause. And I can't reproduce your error on my site even after turning Module cache on.

Could you please turn caching off for this module, test it and let me know?