Merge branch 'master' into collaboration-sarah

1 files changed, 3 insertions, 2 deletions

diff --git a/src/client/views/nodes/FunctionPlotBox.tsx b/src/client/views/nodes/FunctionPlotBox.tsx
index 8a88bede6..61711417f 100644
--- a/src/client/views/nodes/FunctionPlotBox.tsx
+++ b/src/client/views/nodes/FunctionPlotBox.tsx
@@ -80,9 +80,10 @@ export class FunctionPlotBox extends ViewBoxAnnotatableComponent<FieldViewProps>
     @undoBatch
     drop = (e: Event, de: DragManager.DropEvent) => {
         if (de.complete.docDragData?.droppedDocuments.length) {
+            const added = de.complete.docDragData.droppedDocuments.reduce((res, doc) => res && Doc.AddDocToList(this.dataDoc, this.props.fieldKey, doc), true);
+            !added && e.preventDefault();
             e.stopPropagation(); // prevent parent Doc from registering new position so that it snaps back into place
-            de.complete.docDragData.droppedDocuments.map(doc => Doc.AddDocToList(this.dataDoc, this.props.fieldKey, doc));
-            return false;
+            return added;
         }
         return false;
     };