I downloaded the Medieval City map and found Nether portal and entered it while in Creative and the game crashed. After I restarted it and entered the world again, I was in Nether and the game wasn't crashing when using the portal any more.
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Duplicate of MC-12369.
Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-12369. You can view all information known about this specific crash at MCX-405.