Merge branch 'master' of https://github.com/browngraphicslab/Dash-Web

1 files changed, 1 insertions, 1 deletions

diff --git a/src/fields/util.ts b/src/fields/util.ts
index 9e5890aa8..2ff966e7e 100644
--- a/src/fields/util.ts
+++ b/src/fields/util.ts
@@ -362,7 +362,7 @@ export function updateFunction(target: any, prop: any, value: any, receiver: any
             const oldValue = current;
             const newValue = ObjectField.MakeCopy(value);
             current = newValue;
-            if (!(value instanceof CursorField) && !(value?.some((v: any) => v instanceof CursorField))) {
+            if (!(value instanceof CursorField) && !(value?.some?.((v: any) => v instanceof CursorField))) {
                 UndoManager.AddEvent({
                     redo() { receiver[prop] = newValue; },
                     undo() { receiver[prop] = oldValue; }