1 files changed, 10 insertions, 7 deletions
diff --git a/src/client/views/collections/CollectionBaseView.tsx b/src/client/views/collections/CollectionBaseView.tsx
index 444f6fc26..a8b061b04 100644
--- a/src/client/views/collections/CollectionBaseView.tsx
+++ b/src/client/views/collections/CollectionBaseView.tsx
@@ -22,7 +22,7 @@ export interface CollectionRenderProps {
     removeDocument: (document: Document) => boolean;
     moveDocument: (document: Document, targetCollection: Document, addDocument: (document: Document) => boolean) => boolean;
     active: () => boolean;
-    onActiveChanged: (isActive: boolean) => void;
+    whenActiveChanged: (isActive: boolean) => void;
 }
 
 export interface CollectionViewProps extends FieldViewProps {
@@ -55,19 +55,22 @@ export class CollectionBaseView extends React.Component<CollectionViewProps> {
 
     //TODO should this be observable?
     private _isChildActive = false;
-    onActiveChanged = (isActive: boolean) => {
+    whenActiveChanged = (isActive: boolean) => {
         this._isChildActive = isActive;
-        this.props.onActiveChanged(isActive);
+        this.props.whenActiveChanged(isActive);
     }
 
     createsCycle(documentToAdd: Document, containerDocument: Document): boolean {
-        let data = documentToAdd.GetList<Document>(KeyStore.Data, []);
-        for (const doc of data) {
+        if (!(documentToAdd instanceof Document)) {
+            return false;
+        }
+        let data = documentToAdd.GetList(KeyStore.Data, [] as Document[]);
+        for (const doc of data.filter(d => d instanceof Document)) {
             if (this.createsCycle(doc, containerDocument)) {
                 return true;
             }
         }
-        let annots = documentToAdd.GetList<Document>(KeyStore.Annotations, []);
+        let annots = documentToAdd.GetList(KeyStore.Annotations, [] as Document[]);
         for (const annot of annots) {
             if (this.createsCycle(annot, containerDocument)) {
                 return true;
@@ -181,7 +184,7 @@ export class CollectionBaseView extends React.Component<CollectionViewProps> {
             removeDocument: this.removeDocument,
             moveDocument: this.moveDocument,
             active: this.active,
-            onActiveChanged: this.onActiveChanged,
+            whenActiveChanged: this.whenActiveChanged,
         };
         const viewtype = this.collectionViewType;
         return (