Additional code has been added to investigate exception: 'Cannot read property label of undefined' (#2220)

cvat-ui/src/containers/annotation-page/standard-workspace/objects-side-bar/object-item.tsx

@@ -100,10 +100,10 @@ function mapStateToProps(state: CombinedState, own: OwnProps): StateToProps {
         },
     } = state;
 
-    const index = states
+    const stateIDs = states.map((_state: any): number => _state.clientID);
-        .map((_state: any): number => _state.clientID)
+    const index = stateIDs.indexOf(own.clientID);
-        .indexOf(own.clientID);
 
+    try {
         const collapsedState = typeof (statesCollapsed[own.clientID]) === 'undefined'
             ? own.initialCollapsed : statesCollapsed[own.clientID];
 
@@ -123,6 +123,18 @@ function mapStateToProps(state: CombinedState, own: OwnProps): StateToProps {
             normalizedKeyMap,
             aiToolsRef,
         };
+    } catch (exception) {
+        // we have an exception here sometimes
+        // but I cannot understand when it happens and what is the root reason
+        // maybe this temporary hack helps us
+        const dataObject = {
+            index,
+            frameNumber,
+            clientID: own.clientID,
+            stateIDs,
+        };
+        throw new Error(`${exception.toString()} in mapStateToProps of ObjectItemContainer. Data are ${JSON.stringify(dataObject)}`);
+    }
 }
 
 function mapDispatchToProps(dispatch: any): DispatchToProps {