loading a file produces a javascript error Index out of range

Steps to Reproduce

1. load the attached file

Current Result

in developer tool console

zss.wpd:28755 Uncaught Error: Index out of range
at init._checkIndex (zss.wpd:28755)
at init.writeSingle (zss.wpd:28854)
at init._initBIT (zss.wpd:29302)
at init._rebuildBIT (zss.wpd:29325)
at init.$init (zss.wpd:28903)
at new init (zk.wpd:11238)
at init.afterParentChanged_ (zss.wpd:37478)
at init.appendChild (zk.wpd:20992)
at init.setActiveRange (zss.wpd:13245)
at Function._set2 (zk.wpd:12252)

Nothing rendered.

Expected Result

keikai can render the file

Debug Information

Workaround

• unhide hidden columns
• keikai-468.js