Thanks for reporting @oigreslima.

I confirm what you described. The dev team is already reported about this issue.

Information: this issue is already solved and a fix will be included in the next release.

If you want/need to implement it now, then open the file inc/messaging/model/_messaging.funcs.php and replace the section around line 1709 with:

if( empty( $affected_threads_ids ) )
{ // There are no affected thread ids, nothing to delete
	$DB->commit();
	return true;
}

Next release (including fix) likely this week.

Hi @fplanque and @mgsolipa,

Thanks for fix.

I will wait next release :-)

thanks again