Umbraco: 7.8.1

Leblender: 1.0.9.2

uSync: 4.0.4

uSync.ContentEdition: 4.1.1

I've encountered a bug with the LeBlender content mapper. I encountered the following exception when saving a content node

Jumoo.uSync.Content.ContentHandler - Error saving Content: System.InvalidCastException: Cannot cast Newtonsoft.Json.Linq.JObject to Newtonsoft.Json.Linq.JToken.
   at Newtonsoft.Json.Linq.Extensions.Convert[T,U](T token)
   at Newtonsoft.Json.Linq.JToken.Value[T](Object key)
   at Jumoo.uSync.ContentMappers.LeBlenderContentMapper.MapLeBlenderValue(Int32 dataTypeDefinitionId, String value, Boolean import)
   at Jumoo.uSync.ContentMappers.LeBlenderContentMapper.GetExportValue(Int32 dataTypeDefinitionId, String value)
   at Jumoo.uSync.Core.Mappers.GridMapper.ProcessControl(JObject control, Boolean import)
   at Jumoo.uSync.Core.Mappers.GridMapper.ProcessGrid(String content, Boolean import)
   at Jumoo.uSync.Core.Mappers.GridMapper.GetExportValue(Int32 dataTypeDefinitionId, String value)
   at Jumoo.uSync.Core.Serializers.ContentBaseSerializer`1.GetExportIds(PropertyType propType, XElement value)
   at Jumoo.uSync.Core.Serializers.ContentBaseSerializer`1.SerializeBase(IContentBase item, String contentTypeAlias)
   at Jumoo.uSync.Core.Serializers.ContentSerializer.SerializeCore(IContent item)
   at Jumoo.uSync.Core.Serializers.SyncBaseSerializer`1.Serialize(T item)
   at Jumoo.uSync.Content.ContentHandler.ExportItem(IContent item, String path, String rootFolder)

We do have some custom datatypes inside the leblender widgets, but nothing that should cause parsing issues. See the following json snippets from the grid property.

This one fails.

{
    "name":"1 column layout",
    "sections":[
        {
            "grid":12,
            "rows":[
                {
                    "name":"1 Column",
                    "areas":[
                        {
                            "grid":12,
                            "allowAll":false,
                            "allowed":[
                                "rte",
                                "media",
                                "macro",
                                "embed",
                                "banner",
                                "breadcrumb",
                                "divider",
                                "summaryTiles",
                                "categoryStickyNav",
                                "categoryIntro",
                                "productListing",
                                "cta",
                                "linkedList",
                                "summaryFeed",
                                "productGroupIntro",
                                "contentSummary",
                                "folderLinks",
                                "featuredContent",
                                "librarySummaryFeed",
                                "libraryFilter",
                                "relatedContent",
                                "sectionSummaries",
                                "steps",
                                "libraryNavigation",
                                "sectionCtas",
                                "hubspotForm",
                                "imageSet",
                                "backgroundImage",
                                "wistiaEmbed",
                                "testimonials",
                                "iconBlurbSet",
                                "latestNews",
                                "productRelatedContent",
                                "dividerV2",
                                "summaryTilesSimplified",
                                "feed",
                                "productUseCases",
                                "contacts",
                                "siblingNavigation",
                                "contentIntro",
                                "careersEmbed",
                                "simpleCTA",
                                "productThemes",
                                "newsFilter",
                                "contactForm",
                                "paymentForm",
                                "wordArtImage"
                            ],
                            "config":{

                            },
                            "styles":{

                            },
                            "hasConfig":false,
                            "controls":[
                                {
                                    "value":[
                                        {
                                            "customerStories":{
                                                "value":"2195,2196,2197,2198,2199,2203",
                                                "dataTypeGuid":"f908de8f-cff2-4de8-a58b-baf8115844aa",
                                                "editorAlias":"customerStories",
                                                "editorName":"Customer Stories"
                                            },
                                            "link":{
                                                "value":{
                                                    "mode":"internal",
                                                    "label":"Test",
                                                    "target":1186
                                                },
                                                "dataTypeGuid":"fd61907d-0c22-4a91-ba41-5a06d750fbaf",
                                                "editorAlias":"link",
                                                "editorName":"Link"
                                            },
                                            "small":{
                                                "value":3,
                                                "dataTypeGuid":"2e6d3631-066e-44b8-aec4-96f09099b2b5",
                                                "editorAlias":"small",
                                                "editorName":"Small"
                                            },
                                            "medium":{
                                                "value":5,
                                                "dataTypeGuid":"2e6d3631-066e-44b8-aec4-96f09099b2b5",
                                                "editorAlias":"medium",
                                                "editorName":"Medium"
                                            },
                                            "large":{
                                                "value":7,
                                                "dataTypeGuid":"2e6d3631-066e-44b8-aec4-96f09099b2b5",
                                                "editorAlias":"large",
                                                "editorName":"Large"
                                            }
                                        }
                                    ],
                                    "editor":{
                                        "alias":"feed"
                                    },
                                    "active":true,
                                    "guid":"21e9a53e-9735-4ccf-b223-32020aa2c702"
                                }
                            ],
                            "hasActiveChild":true,
                            "active":true
                        }
                    ],
                    "styles":{

                    },
                    "config":{
                        "fullWidth":"1"
                    },
                    "hasConfig":true,
                    "id":"a1a9d807-311e-835b-04a3-dc01704184f3",
                    "hasActiveChild":true,
                    "active":true
                }
            ]
        }
    ]
}

but this one works.

{
    "name":"1 column layout",
    "sections":[
        {
            "grid":12,
            "rows":[
                {
                    "name":"1 Column",
                    "areas":[
                        {
                            "grid":12,
                            "allowAll":false,
                            "allowed":[
                                "rte",
                                "media",
                                "macro",
                                "embed",
                                "banner",
                                "breadcrumb",
                                "divider",
                                "summaryTiles",
                                "categoryStickyNav",
                                "categoryIntro",
                                "productListing",
                                "cta",
                                "linkedList",
                                "summaryFeed",
                                "productGroupIntro",
                                "contentSummary",
                                "folderLinks",
                                "featuredContent",
                                "librarySummaryFeed",
                                "libraryFilter",
                                "relatedContent",
                                "sectionSummaries",
                                "steps",
                                "libraryNavigation",
                                "sectionCtas",
                                "hubspotForm",
                                "imageSet",
                                "backgroundImage",
                                "wistiaEmbed",
                                "testimonials",
                                "iconBlurbSet",
                                "latestNews",
                                "productRelatedContent",
                                "dividerV2",
                                "summaryTilesSimplified",
                                "feed",
                                "productUseCases",
                                "contacts",
                                "siblingNavigation",
                                "contentIntro",
                                "careersEmbed",
                                "simpleCTA",
                                "productThemes",
                                "newsFilter",
                                "contactForm",
                                "paymentForm",
                                "wordArtImage"
                            ],
                            "config":{

                            },
                            "styles":{

                            },
                            "hasConfig":false,
                            "controls":[
                                {
                                    "value":[
                                        {
                                            "text":{
                                                "value":"<p>Testing things</p>",
                                                "dataTypeGuid":"ca90c950-0aff-4e72-b976-a30b1ac57dad",
                                                "editorAlias":"text",
                                                "editorName":"Text"
                                            },
                                            "textSource":{
                                                "value":"2967",
                                                "dataTypeGuid":"c9c11005-1852-426d-a6f0-93ede7175b65",
                                                "editorAlias":"textSource",
                                                "editorName":"Text Source"
                                            },
                                            "printOverride":{
                                                "value":"",
                                                "dataTypeGuid":"c9c11005-1852-426d-a6f0-93ede7175b65",
                                                "editorAlias":"printOverride",
                                                "editorName":"Print Override"
                                            }
                                        }
                                    ],
                                    "editor":{
                                        "alias":"rte"
                                    },
                                    "active":true,
                                    "guid":"3fceada4-6b5f-1df8-bec6-d731944b12a4"
                                }
                            ],
                            "hasActiveChild":true,
                            "active":true
                        }
                    ],
                    "styles":{

                    },
                    "config":{
                        "fullWidth":"1"
                    },
                    "hasConfig":true,
                    "id":"a1a9d807-311e-835b-04a3-dc01704184f3",
                    "hasActiveChild":true,
                    "active":true
                }
            ]
        }
    ]
}

The only structural difference I see is that one of the properties in the failed test stores it's data as json.