ora-6502 - can't append string

I have a script to display all indexes for a particular table in one line. What I did was to loop the retrieval of user tables and append the index name to a variable. I encountered ora-6502 numeric or value error. The code is like this:

     ws_keys char(80) := ' ';

     loop


         :

         ws_keys := ws_keys || index_name;


         :

This script used to work in oracle7.2 but now has problem with oracle8. Pls help. Received on Wed May 12 1999 - 06:55:03 CEST