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Source:
p. 5, b. 123-144
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The correctness of the version of FE (→EE) is confirmed by the sources of the orchestral part – MFrorch and FEorch, whereby the latter contains a cautionary 
before this note in cellos, after the g featured four bars earlier. The pupil's copies also do not indicate a possible oversight of a 
before the discussed note – Chopin did not introduce changes in any of them. Therefore, the natural added in GE (also in cellos) is most probably an arbitrary editorial revision of that edition.
Compare the passage in the sources»
category imprint: Differences between sources
issues: GE revisions
notation: Pitch
Missing markers on sources:
FE1, FED, FEH, FEJ, FES, GE1, GE2, GE3, EE1, EE2, EE3, GE2a, FEFo