diff --git a/changelog.d/20240503_101921_boris_fixed_length_of_undefined.md b/changelog.d/20240503_101921_boris_fixed_length_of_undefined.md
new file mode 100644
index 000000000000..39d41c007e95
--- /dev/null
+++ b/changelog.d/20240503_101921_boris_fixed_length_of_undefined.md
@@ -0,0 +1,4 @@
+### Fixed
+
+- Fixed exception 'Could not read property length of undefined' when copy/paste a skeleton point
+  (<https://github.com/cvat-ai/cvat/pull/7843>)
diff --git a/cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/objects-list.tsx b/cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/objects-list.tsx
index d0e7c78247d0..a8c45ca203c2 100644
--- a/cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/objects-list.tsx
+++ b/cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/objects-list.tsx
@@ -408,7 +408,7 @@ class ObjectsListContainer extends React.PureComponent<Props, State> {
             },
             SWITCH_PINNED: (event: KeyboardEvent | undefined) => {
                 preventDefault(event);
-                const state = activatedState();
+                const state = activatedState(true);
                 if (state && !readonly) {
                     state.pinned = !state.pinned;
                     updateAnnotations([state]);
@@ -456,7 +456,7 @@ class ObjectsListContainer extends React.PureComponent<Props, State> {
             },
             TO_BACKGROUND: (event: KeyboardEvent | undefined) => {
                 preventDefault(event);
-                const state = activatedState();
+                const state = activatedState(true);
                 if (state && !readonly && state.objectType !== ObjectType.TAG) {
                     state.zOrder = minZLayer - 1;
                     updateAnnotations([state]);
@@ -464,14 +464,14 @@ class ObjectsListContainer extends React.PureComponent<Props, State> {
             },
             TO_FOREGROUND: (event: KeyboardEvent | undefined) => {
                 preventDefault(event);
-                const state = activatedState();
+                const state = activatedState(true);
                 if (state && !readonly && state.objectType !== ObjectType.TAG) {
                     state.zOrder = maxZLayer + 1;
                     updateAnnotations([state]);
                 }
             },
             COPY_SHAPE: () => {
-                const state = activatedState();
+                const state = activatedState(true);
                 if (state && !readonly) {
                     copyShape(state);
                 }