emacs crashing on when writing text in telugu-itrans (infact with any
Indian script input method)  while auto-complete-mode[1] enabled.

I can reproduce this on my ubuntu 11.10 and 10.04.

here is how one can reproduce.
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emacs -Q ; start emacs with out any customizations
M-x load-file popup.el ; file attached to this mail
M-x load-file auto-complete.el ; file attached to this mail
M-x switch-to-buffer *scratch* RET
M-x auto-complete-mode ; enable auto-complete-mode
C-\ telugu-itrans RET ; change input method to telugu
; lets type any word twice for eg: nuvvu nuvvu
nuvvu nuvvu
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now emacs crashes

Footnotes:
[1]  http://cx4a.org/software/auto-complete/