Reproduce procedure. 1. Use uim-canna as input method 2. Press Shift-space to enable uim-canna 3. Input some texts. 4. Convert it by space. 5. Press backspace to revert conversion 6. Press space to convert And you'll get backtrace. I tested by revision 1485. Bridge is gtk-immodule.
I cannot reproduce this bug. I tested in svn head and canna-3.7p3 neither gtk-immodule nor uim-xim.
Already fixed now (maybe in r2605).
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