Same problem here, didnt save, when i delete those lines, works one time, and them happens again the problem.
I try disable many of modules, didint work.
What i see, is: after 1st time delete those lines, description and price of product can be edit normally, but another tabs of product, cant.
When i try see those lines again, they are back, and again, i delete. I could edit one tab (that was not working) and save it, but the next time got the same error