Query problem

I have two DBs from the same user. When I run a query: SELECT wer_sys||'.'||wer_int||'.'||wer_wew FROM ver WHERE code = '1243' on a boken DB I get an error:  ERROR:  array value must start with "{" or dimension information but when I try to run the query on a "healthy" DB I don't have the error. Can anyone please guide me where to look for the problem. Already tried restoring the table I run the query on from the non-broken DB but t didn't work. While updating the database with our client program I get psql error: out of memory. The pg version is 8.2 (yes it's old but we are migrating to 9.0).
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Łukasz Brodziak
"Do you bury me when I'm gone
Do you teach me while I'm here
Just as soon I belong
Then it's time I disappear"