Unhandled Exception: System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length
at System.String.Substring(Int32 startIndex, Int32 length)
at Itinero.IO.Osm.Normalizer.AttributeCollectionExtensions.NormalizeMaxspeed(IAttributeCollection tags, IAttributeCollection profileTags)
at Itinero.IO.Osm.Normalizer.DefaultTagNormalizer.Normalize(IAttributeCollection tags, IAttributeCollection profileTags, VehicleCache vehicleCache)
at Itinero.IO.Osm.Streams.RouterDbStreamTarget.b__17_0(OsmGeo osmGeo, Object param)
at OsmSharp.Streams.Filters.OsmStreamFilterDelegate.MoveNext(Boolean ignoreNodes, Boolean ignoreWays, Boolean ignoreRelations)
at OsmSharp.Streams.OsmStreamTarget.DoPull(Boolean ignoreNodes, Boolean ignoreWays, Boolean ignoreRelations)
at Itinero.IO.Osm.Streams.RouterDbStreamTarget.OnBeforePull()