Is there a backup going on - locking the file?

>I have a 24/7 process that runs non-stop. Occasionally, It will bomb with an error 111, "Cannot update the cursor." The Line of code that it trips on is: "INSERT INTO CLOSED FROM MEMVAR". "CLOSED" is a table in a VFP6 Database Container. This does not occur frequently, but normally happens in the middle of the night when I need it to be running most! Thanks for help in advance!