Hi Bojan,
In all likelyhood probably a satellite, but to get a better idea go in to Stellarium and
1. set/look at the exact same position in the sky,
2. set the same field of view,
3. set same image orientation and then
4. scroll the time around the time that the image was taken and
5. SET "Satellite Hint" to ON (on the Bottom of the Screen Menu panel), you may then see a satellite trail which matches your image.
Good Luck
Best
JA
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