diff --git a/src/Umbraco.Web.UI.Client/src/packages/documents/documents/repository/item/types.ts b/src/Umbraco.Web.UI.Client/src/packages/documents/documents/repository/item/types.ts
index 665056af39..d6dfcb6e28 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/documents/documents/repository/item/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/documents/documents/repository/item/types.ts
@@ -9,7 +9,7 @@ export interface UmbDocumentItemModel {
 	documentType: {
 		unique: string;
 		icon: string;
-		collection?: UmbReferenceByUnique;
+		collection: UmbReferenceByUnique | null;
 	};
 	variants: Array<UmbDocumentItemVariantModel>;
 }
diff --git a/src/Umbraco.Web.UI.Client/src/packages/documents/documents/tree/types.ts b/src/Umbraco.Web.UI.Client/src/packages/documents/documents/tree/types.ts
index 9eaac22eea..229e71f366 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/documents/documents/tree/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/documents/documents/tree/types.ts
@@ -11,7 +11,7 @@ export interface UmbDocumentTreeItemModel extends UmbUniqueTreeItemModel {
 	documentType: {
 		unique: string;
 		icon: string;
-		collection?: UmbReferenceByUnique;
+		collection: UmbReferenceByUnique | null;
 	};
 	variants: Array<UmbDocumentTreeItemVariantModel>;
 }
diff --git a/src/Umbraco.Web.UI.Client/src/packages/documents/documents/types.ts b/src/Umbraco.Web.UI.Client/src/packages/documents/documents/types.ts
index 2131d6cf16..c52581f930 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/documents/documents/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/documents/documents/types.ts
@@ -7,7 +7,7 @@ export { UmbDocumentVariantState };
 export interface UmbDocumentDetailModel {
 	documentType: {
 		unique: string;
-		collection?: UmbReferenceByUnique;
+		collection: UmbReferenceByUnique | null;
 	};
 	entityType: UmbDocumentEntityType;
 	isTrashed: boolean;
diff --git a/src/Umbraco.Web.UI.Client/src/packages/media/media/repository/item/types.ts b/src/Umbraco.Web.UI.Client/src/packages/media/media/repository/item/types.ts
index c8af0e94c8..5d9b42300e 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/media/media/repository/item/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/media/media/repository/item/types.ts
@@ -6,7 +6,7 @@ export interface UmbMediaItemModel {
 	mediaType: {
 		unique: string;
 		icon: string;
-		collection?: UmbReferenceByUnique;
+		collection: UmbReferenceByUnique | null;
 	};
 	variants: Array<UmbMediaItemVariantModel>;
 	name: string; // TODO: get correct variant name
diff --git a/src/Umbraco.Web.UI.Client/src/packages/media/media/tree/types.ts b/src/Umbraco.Web.UI.Client/src/packages/media/media/tree/types.ts
index 0907b7688a..8c872803cc 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/media/media/tree/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/media/media/tree/types.ts
@@ -9,7 +9,7 @@ export interface UmbMediaTreeItemModel extends UmbUniqueTreeItemModel {
 	mediaType: {
 		unique: string;
 		icon: string;
-		collection?: UmbReferenceByUnique;
+		collection: UmbReferenceByUnique | null;
 	};
 	variants: Array<UmbMediaTreeItemVariantModel>;
 }
diff --git a/src/Umbraco.Web.UI.Client/src/packages/members/member/repository/item/types.ts b/src/Umbraco.Web.UI.Client/src/packages/members/member/repository/item/types.ts
index ce9e9a53b4..4993561027 100644
--- a/src/Umbraco.Web.UI.Client/src/packages/members/member/repository/item/types.ts
+++ b/src/Umbraco.Web.UI.Client/src/packages/members/member/repository/item/types.ts
@@ -5,7 +5,7 @@ export interface UmbMemberItemModel {
 	memberType: {
 		unique: string;
 		icon: string;
-		collection?: UmbReferenceByUnique;
+		collection: UmbReferenceByUnique | null;
 	};
 	variants: Array<UmbMemberVariantItemModel>;
 }