Merge pull request #1787 from sagar-joshi/bug-editor-crashes-on-adding-sketch-to-a-collection

access item.project only if item.isDeleted is false

Author: catarak

client/modules/IDE/components/AddToCollectionSketchList.jsx

@@ -52,8 +52,9 @@ class SketchList extends React.Component {
   };
 
   inCollection = (sketch) =>
-    this.props.collection.items.find((item) => item.project.id === sketch.id) !=
-    null;
+    this.props.collection.items.find((item) =>
+      item.isDeleted ? false : item.project.id === sketch.id
+    ) != null;
 
   render() {
     const hasSketches = this.props.sketches.length > 0;