Bug incomplete path from analyzeMap

Hi some one knows why the path is incomplete from osmsurround ?
http://ra.osmsurround.org/analyzeMap?relationId=2554093
https://www.openstreetmap.org/relation/2554093

http://ra.osmsurround.org/exportRelation/json?relationId=2554093 : 
> 500
`org.osmtools.ra.AnalyzerException: No way to go. All nodes visited before.`

Thanks.