In FE (→GE) a 
was repeated before g
2, the top note of the third on the 2nd beat of the bar, which suggests that in spite of the practical, one-part notation, Chopin led two separate voices in his mind (it is more frequent to encounter overlooked signs due to this reason, e.g. in b. 152 or in the Etude in G
Minor, Op. 25 No. 6, b. 12). In EE this additional accidental is present only just on the 3rd beat of the bar.
Compare the passage in the sources »
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, Cautionary accidentals
notation: Pitch