clean.to_file Error - strange 0/NaN column in cleaned output

[LiamTrees]

Experiencing this error with clean.to_file after using the clean_crowns function:

AttributeError Traceback (most recent call last)
in <cell line: 1>()
----> 1 clean.to_file(site_path + "/crowns_out.gpkg")

5 frames
/usr/local/lib/python3.10/dist-packages/geopandas/geodataframe.py in to_file(self, filename, driver, schema, index, **kwargs)
1261 from geopandas.io.file import _to_file
1262
-> 1263 _to_file(self, filename, driver, schema, index, **kwargs)
1264
1265 def set_crs(self, crs=None, epsg=None, inplace=False, allow_override=False):

/usr/local/lib/python3.10/dist-packages/geopandas/io/file.py in _to_file(df, filename, driver, schema, index, mode, crs, engine, **kwargs)
570
571 if engine == "fiona":
--> 572 _to_file_fiona(df, filename, driver, schema, crs, mode, **kwargs)
573 elif engine == "pyogrio":
574 _to_file_pyogrio(df, filename, driver, schema, crs, mode, **kwargs)

/usr/local/lib/python3.10/dist-packages/geopandas/io/file.py in _to_file_fiona(df, filename, driver, schema, crs, mode, **kwargs)
596 elif crs:
597 crs_wkt = crs.to_wkt("WKT1_GDAL")
--> 598 with fiona.open(
599 filename, mode=mode, driver=driver, crs_wkt=crs_wkt, schema=schema, **kwargs
600 ) as colxn:

/usr/local/lib/python3.10/dist-packages/fiona/env.py in wrapper(*args, **kwds)
455
456 with env_ctor(session=session):
--> 457 return f(*args, **kwds)
458
459 return wrapper

/usr/local/lib/python3.10/dist-packages/fiona/init.py in open(fp, mode, driver, schema, crs, encoding, layer, vfs, enabled_drivers, crs_wkt, allow_unsupported_drivers, **kwargs)
301 )
302 elif mode == "w":
--> 303 colxn = Collection(
304 path,
305 mode,

/usr/local/lib/python3.10/dist-packages/fiona/collection.py in init(self, path, mode, driver, schema, crs, encoding, layer, vsi, archive, enabled_drivers, crs_wkt, ignore_fields, ignore_geometry, include_fields, wkt_version, allow_unsupported_drivers, **kwargs)
244 elif self.mode in ("a", "w"):
245 self.session = WritingSession()
--> 246 self.session.start(self, **kwargs)
247 except OSError:
248 self.session = None

fiona/ogrext.pyx in fiona.ogrext.WritingSession.start()

AttributeError: 'int' object has no attribute 'encode'

[PatBall1]

Thanks @LiamTrees for raising this issue - I am looking into it! Would you mind posting a screen grab of how the geopandas df looked (with the strange 0 column)?

The behaviour comes from a recent update I made to the clean_crowns function.