[otrs] Sudden error from cron jobs

Hi all, After running OTRS v2.0.4 for a while under RHEL4, I am suddenly getting the following perl error every time the cron jobs get run: perl: prescan_stmt.c:442: rewrite_execute_stmt: Assertion `ph <= imp_sth->phc' failed. /bin/sh: line 1: 16181 Aborted $HOME/bin/PostMasterPOP3.pl >>/dev/null It seems to be a low level code error, I have no idea what this message is trying to tell me. Has anyone seen this before? Regards, Graham --