One of two things --

You changed the .def file or database definition.

Or, more likely, you made a change to jump.cgi so it's not properly exectuing the test block that first checks to see if the entry exists before trying to update the hits table.

The hits table needs a compound key, such that LinkID and IP are not individually uniqute, but the combination of a LinkID-IP _is_ unique.

What it seems to be doing is attempting to input the second hit on the link as a "hit"

Check your .def files and make sure they are not individually "unique"

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