global serach may break cron execution

When global search is enabled, cron execution in RHEL5 64bit is stopped with the following output:

...omissis....
Processing cron function for rss_client....
0 feeds refreshed (took 0.003565 seconds)
done.
Processing cron function for search....
-DELETE---
cron script completed

Disabling the global search cron is not stopped anymore:

...omissis...
Processing cron function for rss_client....
0 feeds refreshed (took 0.0036929999999999 seconds)
done.
Processing cron function for search....Global searching is not enabled. Nothing performed by search.
done.
Finished blocks
Starting admin reports
Finished admin reports
Updating languages cache
Removing expired enrolments ...none found
Starting main gradebook job ...
done.
...omissis...
Cron script completed correctly
Execution took 0.220487 seconds
cron script completed.

In the global search, index has been created manually, so there should be no concerns for Lucene to stop execution due to missing indexes.