Assertion error while merging edges

[Nate-Wessel]

nate@nate-laptop:~/bike-map$ python3 merge-edges.py
finished checking 2.11% of 246811 nodes
as yet unhandled exception
321121783 Edge osm_id:29197151, db_uid:84106 Edge osm_id:29197151, db_uid:84114
finished checking 24.92% of 246811 nodes
as yet unhandled exception
848274609 Edge osm_id:71270919, db_uid:290082 Edge osm_id:71270919, db_uid:290052
finished checking 47.81% of 246811 nodes
as yet unhandled exception
4615764701 Edge osm_id:466858100, db_uid:548845 Edge osm_id:466858100, db_uid:548863
Traceback (most recent call last): nodes
  File "merge-edges.py", line 66, in <module>
    assert edge_cursor.rowcount == 2
AssertionError