Steps to Reproduce

1. load the attached file

Current Result

zss.wpd:28677 Uncaught Error: Index out of range
at init._checkIndex (zss.wpd:28677)
at init.writeSingle (zss.wpd:28776)
at init._initBIT (zss.wpd:29219)
at init._rebuildBIT (zss.wpd:29233)
at init.$init (zss.wpd:28825)
at new init (zk.wpd:11238)
at init.afterParentChanged_ (zss.wpd:37335)
at init.appendChild (zk.wpd:20992)
at init.setActiveRange (zss.wpd:13227)
at Function._set2 (zk.wpd:12252)

Expected Result

render a sheet without javascript error