There are no mods when I get close to a specific area (It's an arena made of obsidian and netherrack) When the arena starts generating (Underneeth it is some flowing lava, not much, and water is flowing in the middle) I receive this error. The closer I got, the more it would crash. So I put myself in the center of the arena, and the game now gives me this error. I ran some region fixers, and opened with MC Edit, and they all work fine.
I put the map in single player (Again, no mods, no anything) and it still crashed in the same spot. I posted the file below.
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Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-2956. If I am wrong, please go yell at Dinnerbone.