could not send data to client: Broken pipe

Hi;
Hope somebody can help to figure out my problem.
When I run this sentence manually "psql -U user -d db_name -f /
script.sql" , It runs perfectly.(4033 rows are inserted).
Yet, when I run it using crontab, Only 77 rows are inserted.

when I see the postgres Log, it shows me this after row 77
.....
2009-09-16 09:57:01 AST LOG: could not send data to client: Broken
pipe
2009-09-16 09:57:01 AST LOG: unexpected EOF on client connection


Thanks a lot for your help

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