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NullPointerException during concurrent merges #3555
Looks like it may be related to the new suggestion stuff. I'm on 0.90.3, Java 7. Will be trying to reproduce on master shortly, but let me know if there's other stuff you need to debug.
[2013-08-21 22:02:05,166][WARN ][index.engine.robin ] [qanticharm] [quizlet] failed engine