fixed pdf bug

1 files changed, 13 insertions, 9 deletions

diff --git a/src/client/util/DragManager.ts b/src/client/util/DragManager.ts
index bb9a3b793..0dcaa9c77 100644
--- a/src/client/util/DragManager.ts
+++ b/src/client/util/DragManager.ts
@@ -123,17 +123,21 @@ export namespace DragManager {
         //      So we replace the pdf's canvas with the image thumbnail
         const docView: DocumentView = dragData["documentView"];
         const doc: Document = docView ? docView.props.Document : dragData["document"];
-        var pdfBox = dragElement.getElementsByClassName("pdfBox-cont")[0] as HTMLElement;
-        let thumbnail = doc.GetT(KeyStore.Thumbnail, ImageField);
-        if (pdfBox && pdfBox.childElementCount && thumbnail) {
-            let img = new Image();
-            img!.src = thumbnail.toString();
-            img!.style.position = "absolute";
-            img!.style.width = `${rect.width / scaleX}px`;
-            img!.style.height = `${rect.height / scaleY}px`;
-            pdfBox.replaceChild(img!, pdfBox.children[0])
+
+        if (doc) {
+            var pdfBox = dragElement.getElementsByClassName("pdfBox-cont")[0] as HTMLElement;
+            let thumbnail = doc.GetT(KeyStore.Thumbnail, ImageField);
+            if (pdfBox && pdfBox.childElementCount && thumbnail) {
+                let img = new Image();
+                img!.src = thumbnail.toString();
+                img!.style.position = "absolute";
+                img!.style.width = `${rect.width / scaleX}px`;
+                img!.style.height = `${rect.height / scaleY}px`;
+                pdfBox.replaceChild(img!, pdfBox.children[0])
+            }
         }
 
+
         dragDiv.appendChild(dragElement);
 
         let hideSource = false;