ArgumentException for WbGlobeCoordinate with precision = null

[j-bbr]

During processing of a recent wikidata dump I noticed that WbGlobeCoordinate throws an ArgumentException if the precision field is null. Here is the relevant portion from an example entity (Berlin TV Tower) from the dump where that occurs:

"P625": [
            {
                "mainsnak": {
                    "snaktype": "value",
                    "property": "P625",
                    "datavalue": {
                        "value": {
                            "latitude": 52.520833333333,
                            "longitude": 13.409444444444,
                            "altitude": null,
                            "precision": null,
                            "globe": "http:\/\/www.wikidata.org\/entity\/Q2"
                        },
                        "type": "globecoordinate"
                    },
                    "datatype": "globe-coordinate"
                },
                "type": "statement",
                "id": "q151356$2200165A-750E-42AB-BC62-4F23EF25F202",
                "rank": "normal"
            }
        ]

Maybe the precision field could be made nullable in WbGlobeCoordinate?

[mormegil-cz]

Just came here to report the same! I’m surprised this is allowed on Wikidata/Wikibase side, but it apparently occurs (for me, this was Q744598). In the Wikidata UI, the precision (shown when editing the claim) is shown as “unspecified”, but it cannot be set to unspecified after choosing anything else; strange.

For completeness, the exception callstack is

System.ArgumentException: Can not convert Null to Double.
   at Newtonsoft.Json.Linq.JToken.op_Explicit(JToken value)
   at WikiClientLibrary.Wikibase.DataTypes.BuiltInDataTypes.<>c.<.cctor>b__46_19(JToken e)
   at WikiClientLibrary.Wikibase.DataTypes.DelegatePropertyType`1.Parse(JToken expr)
   at WikiClientLibrary.Wikibase.Snak.get_DataValue()