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The very tips of indoor plant near harvest turning yellow. What is the cause, treatment?

Growing Jack Herer auto indoors. Had huge veg stage and now several weeks into flowering. But. No buds are forming. Never had this happen before. It's around 7 weeks. I switched from 18/6 light cycle to 12/12 to see if this would help. Did a lot of deflowering and topped it early on, but...