git push problem: non fast forward

Ошибка git failed to push some refs ...Updates were rejected because a pushed branch tip is behind its remote + non-fast-forward

ВНИМАНИЕ: не делайте в этой теме резких движений! Есть риск потерять данные.

git error: failed to push some refs to
git Updates were rejected because a pushed branch tip is behind its remote

Вообще речь идёт об ошибке вида:

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