Socrates was blamed of this by being wrongly interpreted of saying: "I know that I don't Know." or other variants. What he really said was: "I neither know nor think that I know."
Source: https://en.wikipedia.org/wiki/I_know_that_I_know_nothing
I then began to wonder which other philosophers have been wrongly charged with this fallacy (even implicitly), or have not been charged, yet are guilty of it?