bug - when Restore env option

PostgreSQL version: 8.2.4
pgAdmin version:1.8.0 beta2
Operating system: Windows XP SP2

Details:   1. connect to the server. in  treeview open one schema (etc ,public)   2. select server and executing
"properties"  3. turn Restore env option on and click Ok button to save properties   4. close pgadmin   5. start
pgadminand connect to the server. and then public schema
 
will be selected and opened.   6. right click public schema. "Backup server ..."  will display in PopMenu.   7. click
Backupserver ... then a fatal error has occurred
 


I do this many times and  a fatal error  still be occurred.