[phpOpenTracker-general] phpOpenTracker Error: Duplicate entry for key 1

Hi,

I have been happily using php Open Tracker on a rather old webserver. 
I really like it.

After moving to a new server, I made a clean install on a Mysql-4.1
database using
the merged tables setup (myisam_merge.sql) the trouble began.

I have been rather surprised that even in a low traffic environment I
came across some errors like this "phpOpenTracker Error: Duplicate
entry '2147483647' for key 1"

Having searched in Google it told me at some place that this is due to
the fact that phpopentracker is reducing overhead by not checking the
existence of keys and that these messages can be ignored.

I am not very happy with this answer.  Performing a Google search for
phpOpenTracker Error: Duplicate entry '2147483647' for key 1
results in 99 hits, including the exact! number.

In my eyes something seems to be systematically wrong.

Any suggestions/solutions?