This is a bug report based on the issue discussed at


The plain tex code shown above fails with a lua error:
luatex-fonts-merged.lua:9616: attempt to index local 'current' (a nil value)

My guess is: as math-on (math-off too) is a "discardable" item after a
linebreak, the first math-on node has gone away. So the
math-on/math-off pair has become broken, by which the behavior of
"node.end_of_math" is confused.

Dohyun Kim
Seoul, Republic of Korea
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