Merge branch 'parker'

1 files changed, 7 insertions, 2 deletions

diff --git a/src/fields/util.ts b/src/fields/util.ts
index d87bb6656..b3cbbe241 100644
--- a/src/fields/util.ts
+++ b/src/fields/util.ts
@@ -445,8 +445,13 @@ export function updateFunction(target: any, prop: any, value: any, receiver: any
                               undo: action(() => {
                                   // console.log("undo $add: " + prop, diff.items) // bcz: uncomment to log undo
                                   diff.items.forEach((item: any) => {
-                                      const ind = receiver[prop].indexOf(item.value ? item.value() : item);
-                                      ind !== -1 && receiver[prop].splice(ind, 1);
+                                      if (item instanceof SchemaHeaderField) {
+                                          const ind = receiver[prop].findIndex((ele: any) => ele instanceof SchemaHeaderField && ele.heading === item.heading);
+                                          ind !== -1 && receiver[prop].splice(ind, 1);
+                                      } else {
+                                          const ind = receiver[prop].indexOf(item.value ? item.value() : item);
+                                          ind !== -1 && receiver[prop].splice(ind, 1);
+                                      }
                                   });
                                   lastValue = ObjectField.MakeCopy(receiver[prop]);
                               }),