I've had this happen occasionally. When it happened to me I put my finger nail under the latch on the take up lever and very gently pulled it up a bit as it appeared to flat against the take up lever - so much so I never even noticed it a first. I think it was sliding past the latch rather than going under it. So when I raised it gently the thread could then go under and not over it. I've never had the problem since.
"With all its sham, drudgery and broken dreams,
it is still a beautiful world. Be cheerful. Strive to be happy." Max Ehrmann