The LuaTeX-ja project submitted an update to the
luatexja
package.
Version: 20150518.0 License: bsd
Summary description: Typeset Japanese with lua(la)tex.
Announcement text: ----------------------------------------------------------------------
Fix crash by an accent like o, when the fontspec package is not loaded.
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This package is located at http://mirror.ctan.org/macros/luatex/generic/luatexja/
More information is at http://www.ctan.org/pkg/luatexja
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Thanks for the upload.
For the CTAN Team Petra Rübe-Pugliese