For those interested, apparently there was a recent accident at a campsite inside Ol Doinyo Lengai's active crater, and one person sustained second degree burns when the lava (not as hot as basalt lava, but still plenty hot) actually entered the tent. He was evacuated safely, but the safety warning indicated it is no longer safe to camp in the active crater.
Reminds me of the time I camped on the beach and the tide came in while I was asleep. What a mess.