bash error on tab completion Ubuntu 8.04

[Cian Brennan,v177B,017005132,0851601473]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' 
-DLOCALEDIR='/fast-storage/users/l/lil_cain/32bit/share/locale' 
-DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux carbon 2.6.24-22-generic #1 SMP Mon Nov 24 18:32:42 UTC 
2008 i686 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.0
Patch Level: 0
Release Status: release

Description:
        When attempting tab completion, the following error occcurs:
                malloc: /Users/chet/src/bash/src/parse.y:5561: assertion botched
                free: called with unallocated block argument
                last command: (null)
                Aborting...Aborted
        Bash then exits.


Repeat-By:
        Run Bash. Type ls *. Hit tab.