From 890a40ef8cc2efa7beea5722301b59ede5141238 Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Thu, 30 May 2019 13:47:53 -0400
Subject: fixed context menus and tree view jitter.

---
 src/client/util/DragManager.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/client/util/DragManager.ts')

diff --git a/src/client/util/DragManager.ts b/src/client/util/DragManager.ts
index 7f75a95f0..8f0cce095 100644
--- a/src/client/util/DragManager.ts
+++ b/src/client/util/DragManager.ts
@@ -26,7 +26,7 @@ export function SetupDrag(_reference: React.RefObject<HTMLElement>, docFunc: ()
         // if (this.props.isSelected() || this.props.isTopMost) {
         if (e.button === 0) {
             e.stopPropagation();
-            if (e.shiftKey) {
+            if (e.shiftKey && CollectionDockingView.Instance) {
                 CollectionDockingView.Instance.StartOtherDrag([await docFunc()], e);
             } else {
                 document.addEventListener("pointermove", onRowMove);
@@ -264,7 +264,7 @@ export namespace DragManager {
             if (dragData instanceof DocumentDragData) {
                 dragData.userDropAction = e.ctrlKey || e.altKey ? "alias" : undefined;
             }
-            if (e.shiftKey) {
+            if (e.shiftKey && CollectionDockingView.Instance) {
                 AbortDrag();
                 CollectionDockingView.Instance.StartOtherDrag(docs, {
                     pageX: e.pageX,
-- 
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