Duplicate entry '0' error when returning to site after paypal transaction.

After a successful product sale and transaction through paypal, I receive the following error on the site when i return to my site from paypal. I was using 6.x-4.0-rc9, and upgraded to dev to see if it fixed it (it did not).
It appears the store has started numbering transaction #'s over again at 1, instead of starting them at the last transaction # before the first upgrade from version 5. How can this be fixed?

* user warning: Duplicate entry '0' for key 1 query: INSERT INTO ec_transaction (ecid, type, mail, payment_method, allocation, workflow, shippable, currency, gross, allocated, balance, created, changed, duedate, token) VALUES (1, 'ec_cart', 'ragsman@ragsman.com', 'paypal_basic', 0, 1, 1, 'USD', 1, 0, 1, 1263401547, 1263401547, 0, '') in /home/nucpros/domains/nucpros.com/public_html/includes/common.inc on line 3467.
* warning: array_filter() [function.array-filter]: The first argument should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 176.
* warning: array_map() [function.array-map]: Argument #2 should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 177.
* warning: array_sum() [function.array-sum]: The argument should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 177.
* warning: array_filter() [function.array-filter]: The first argument should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 185.
* warning: array_map() [function.array-map]: Argument #2 should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 186.
* warning: array_sum() [function.array-sum]: The argument should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 186.
* warning: array_filter() [function.array-filter]: The first argument should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 194.
* warning: array_map() [function.array-map]: Argument #2 should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 195.
* warning: array_sum() [function.array-sum]: The argument should be an array in /home/nucpros/domains/nucpros.com/public_html/modules/ecommerce/ec_store/ec_store.alloc.inc on line 195.