mistaken quail input ruins input for rest of session

[Dan Jacobson]

I was typing along in big5 Chinese when suddenly about every other
keystroke would make the screen flash, e.g. when typing "n": 
Signaling: (args-out-of-range [152187 152245] 2)
  quail-get-current-str(1 ((2 0 2 1 1) . [152187 152245]))
  quail-translate-key()
  byte-code("ÀÁ !ˆÂ‡" [quail-update-translation quail-translate-key t] 2)
  quail-self-insert-command()
  call-interactively(quail-self-insert-command)
  quail-start-translation(110)
  quail-input-method(110)

Wait a second, it looks like all my problems started when instead of
typing ye3, I typed the non-pinyin yen3!

C-\ x i a n 4 2 z a i 4 1 y e n 3 backspace backspace 
                              ^
backspace y e 3 n e backspace C-e n e n e backspace 
backspace backspace SPC n e backspace backspace C-x 

Later I switched to a fresh buffer but was still plagued with flashing
screens.

OK, I give it to you to research.  It seems I am not able to input at
least Chinese words starting with "n" for the rest of this emacs session,
e.g. neng2.
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