APEX

Hi, I'm working with Application Express 4.1.1.00.23.

I have an application for timesheet management.
On one page, I've got a report (not interactive) in which you can enter the hours you've worked. First you add a free line, choose the task and then enter the hours you've spent.

You can only have one empty line at a time. If you try to add a line when you already have an empty line, a validation will display an error. It worked fine in version 3.2. Now we upgraded to 4.1 and get a weird error :
1) The validation msg appears fine
2) The report appears fine
3) There is a msg at the end of the report saying :
report error:
ORA-01403: no data found
ORA-06510: PL/SQL: unhandled user-defined exception


Could somebody point out the source of this problem ?
Thank you!
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Here is the debug :
..........
0.31117 0.00204 parse query as: FEUILLES_DE_TEMPS 4

0.31319 0.07865 ...Execute Statement: select NULL "CHECK$01", NULL "nom_projet2", NULL "NO_TACHE_ENTRE", NULL "NO_TACHE", NULL "NO_SEMAINE_EMPLOYE", NULL "NOM_TACHE", NULL "Tâches", NULL "SEQUENCE", NULL "Heures dim", NULL "DIM", NULL "Heures lun", NULL "LUN", NULL "Heures mar", NULL "MAR", NULL "Heures mer", NULL "MER", NULL "Heures jeu", NULL "JEU", NULL "Heures ven", NULL "VEN", NULL "Heures sam", .........

0.39191 0.00158 print column headings 4

0.39342 0.02546 rows loop: 500 row(s) 4

0.41889 0.00087 report error: ORA-01403: no data found ORA-06510: PL/SQL: unhandled user-defined exception
.....