Hi migius,
I used your dxf r2.13 free trunk exporter for just one mesh with vertices and lines on XY plan but nothing exported:
http://storage5.static.itmages.com/i/16/1129/h_1480440268_2875029_2d671a2145.jpeg
traceback:
Exporting to /home/patrinux/San_Vito-jeu_final_2.77.01.blend.dxf
Generating Object list for export... (Root parents only)
0 objects exported in 0.00 seconds. -----DONE-----
Finished