some problems in get_next

Hi,

I suffered from a problem.
As I put the " Select Instance "button in the MIB browser,
it will do nothing.
But as I put "Prompt For Instance", that I could key in anyone I want, it can work well. 
In the code, the function, XXX_next_data_point, has been called 5 times repeatedly.
And it always returns NULL.
It seems to call the GET_NEXT, doesn't it ??
Is anything lost in it, so it could not return normally.
Thanks for your help!!

Kaiyu

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