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I suspect the issue is that you are iterating over every possible party unitframe, even when no unit has been assigned to it. If there is no unit, there is no name token to pass into strsplit.
What I suspect you need to do is listen to GROUP_ROSTER_UPDATE and iterate over the party frames that actually have assigned units.
That is the only thing I can think of looking over your code.
Hopefully someone else will take a look and offer some insight.
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