From 64b062eab72e78776a78b9983c7ddcd7afde66b0 Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Thu, 18 Apr 2019 16:38:33 -0400
Subject: avoid exception

---
 src/client/util/DragManager.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/client/util/DragManager.ts b/src/client/util/DragManager.ts
index 426c9fc3d..46658867b 100644
--- a/src/client/util/DragManager.ts
+++ b/src/client/util/DragManager.ts
@@ -272,7 +272,7 @@ export namespace DragManager {
         AbortDrag = () => {
             document.removeEventListener("pointermove", moveHandler, true);
             document.removeEventListener("pointerup", upHandler);
-            dragElements.map(dragElement => dragDiv.removeChild(dragElement));
+            dragElements.map(dragElement => { if (dragElement.parentNode == dragDiv) dragDiv.removeChild(dragElement); });
             eles.map(ele => (ele.hidden = false));
         };
         const upHandler = (e: PointerEvent) => {
-- 
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