diff --git a/aiida_workgraph/engine/workgraph.py b/aiida_workgraph/engine/workgraph.py
index d41714d2..ab63693f 100644
--- a/aiida_workgraph/engine/workgraph.py
+++ b/aiida_workgraph/engine/workgraph.py
@@ -1079,10 +1079,13 @@ def run_tasks(self, names: t.List[str], continue_workgraph: bool = True) -> None
                     executor, args, kwargs, var_args, var_kwargs
                 )
                 if not isinstance(results, dict):
-                    self.report("The results of the awaitable builder must be a dict.")
+
+                    self.logger.error(
+                        "The results of the awaitable builder must be a dict."
+                    )
                     for key, value in results.items():
                         if not isinstance(value, ProcessNode):
-                            self.report(
+                            self.logger.error(
                                 f"The value of key {key} is not an instance of ProcessNode."
                             )
                             self.set_task_state_info(name, "state", "Failed")
diff --git a/aiida_workgraph/utils/__init__.py b/aiida_workgraph/utils/__init__.py
index cc04c555..7e8a4082 100644
--- a/aiida_workgraph/utils/__init__.py
+++ b/aiida_workgraph/utils/__init__.py
@@ -261,7 +261,7 @@ def get_parent_workgraphs(pk: int) -> list:
 
 
 def get_processes_latest(
-    pk: int, node_name: str = None
+    pk: int, node_name: str = None, item_type: str = "task"
 ) -> Dict[str, Dict[str, Union[int, str]]]:
     """Get the latest info of all tasks from the process."""
     import aiida
@@ -270,39 +270,53 @@ def get_processes_latest(
     from aiida_workgraph.engine.workgraph import WorkGraphEngine
 
     tasks = {}
-    node_names = [node_name] if node_name else []
-    if node_name:
-        projections = [
-            f"extras._task_state_{node_name}",
-            f"extras._task_process_{node_name}",
-        ]
-    else:
-        projections = []
-        process = aiida.orm.load_node(pk)
-        node_names = [
-            key[12:]
-            for key in process.base.extras.keys()
-            if key.startswith("_task_state")
-        ]
-        projections = [f"extras._task_state_{name}" for name in node_names]
-        projections.extend([f"extras._task_process_{name}" for name in node_names])
-    qb = QueryBuilder()
-    qb.append(WorkGraphEngine, filters={"id": pk}, project=projections)
-    # print("projections: ", projections)
-    results = qb.all()
-    # change results to dict
-    results = dict(zip(projections, results[0]))
-    # print("results: ", results)
-    for name in node_names:
-        state = results[f"extras._task_state_{name}"]
-        task_process = deserialize_unsafe(results[f"extras._task_process_{name}"])
-        tasks[name] = {
-            "pk": task_process.pk if task_process else None,
-            "process_type": task_process.process_type if task_process else "",
-            "state": state,
-            "ctime": task_process.ctime if task_process else None,
-            "mtime": task_process.mtime if task_process else None,
-        }
+    if item_type == "called_process":
+        # fetch the process that called by the workgraph
+        node = aiida.orm.load_node(pk)
+        for link in node.base.links.get_outgoing().all():
+            if isinstance(link.node, aiida.orm.ProcessNode):
+                tasks[f"{link.node.process_label}_{link.node.pk}"] = {
+                    "pk": link.node.pk,
+                    "process_type": link.node.process_type,
+                    "state": link.node.process_state.value,
+                    "ctime": link.node.ctime,
+                    "mtime": link.node.mtime,
+                }
+    elif item_type == "task":
+        node_names = [node_name] if node_name else []
+        if node_name:
+            projections = [
+                f"extras._task_state_{node_name}",
+                f"extras._task_process_{node_name}",
+            ]
+        else:
+            projections = []
+            process = aiida.orm.load_node(pk)
+            node_names = [
+                key[12:]
+                for key in process.base.extras.keys()
+                if key.startswith("_task_state")
+            ]
+            projections = [f"extras._task_state_{name}" for name in node_names]
+            projections.extend([f"extras._task_process_{name}" for name in node_names])
+        qb = QueryBuilder()
+        qb.append(WorkGraphEngine, filters={"id": pk}, project=projections)
+        # print("projections: ", projections)
+        results = qb.all()
+        # change results to dict
+        results = dict(zip(projections, results[0]))
+        # print("results: ", results)
+        for name in node_names:
+            state = results[f"extras._task_state_{name}"]
+            task_process = deserialize_unsafe(results[f"extras._task_process_{name}"])
+            tasks[name] = {
+                "pk": task_process.pk if task_process else None,
+                "process_type": task_process.process_type if task_process else "",
+                "state": state,
+                "ctime": task_process.ctime if task_process else None,
+                "mtime": task_process.mtime if task_process else None,
+            }
+
     return tasks
 
 
diff --git a/aiida_workgraph/web/backend/app/workgraph.py b/aiida_workgraph/web/backend/app/workgraph.py
index 20c51db8..fef88692 100644
--- a/aiida_workgraph/web/backend/app/workgraph.py
+++ b/aiida_workgraph/web/backend/app/workgraph.py
@@ -100,11 +100,11 @@ async def read_workgraph(id: int):
 
 
 @router.get("/api/workgraph-state/{id}")
-async def read_workgraph_tasks_state(id: int):
+async def read_workgraph_tasks_state(id: int, item_type: str = "task"):
     from aiida_workgraph.utils import get_processes_latest
 
     try:
-        processes_info = get_processes_latest(id)
+        processes_info = get_processes_latest(id, item_type=item_type)
         return processes_info
     except KeyError:
         raise HTTPException(status_code=404, detail=f"Workgraph {id} not found")
diff --git a/aiida_workgraph/web/frontend/src/components/WorkGraphDuration.js b/aiida_workgraph/web/frontend/src/components/WorkGraphDuration.js
index 3a9cb3cd..c1835d7c 100644
--- a/aiida_workgraph/web/frontend/src/components/WorkGraphDuration.js
+++ b/aiida_workgraph/web/frontend/src/components/WorkGraphDuration.js
@@ -10,11 +10,11 @@ const NodeDurationGraph = ({ id }) => {
     const [timeStart, setTimeStart] = useState(null);
     const [timeEnd, setTimeEnd] = useState(null);
     const [initialLoad, setInitialLoad] = useState(true);
+    const [useItemType, setUseItemType] = useState("task");
 
-    // Function to fetch data from the backend
     const fetchData = async () => {
         try {
-            const response = await fetch(`http://localhost:8000/api/workgraph-state/${id}`);
+            const response = await fetch(`http://localhost:8000/api/workgraph-state/${id}?item_type=${useItemType}`);
             if (!response.ok) {
                 throw new Error('Network response was not ok');
             }
@@ -26,10 +26,11 @@ const NodeDurationGraph = ({ id }) => {
     };
 
     useEffect(() => {
+        setInitialLoad(true);
         fetchData();
         const interval = setInterval(fetchData, 5000);
         return () => clearInterval(interval);
-    }, [id]);
+    }, [id, useItemType]);
 
     useEffect(() => {
         if (Object.keys(processesInfo).length) {
@@ -38,15 +39,13 @@ const NodeDurationGraph = ({ id }) => {
                 title: key
             }));
 
-            const newItems = Object.entries(processesInfo).map(([key, { ctime, mtime, process_type }], idx) => {
-                return process_type ? {
-                    id: idx,
-                    group: idx,
-                    title: key,
-                    start_time: ctime ? moment(ctime) : null,
-                    end_time: mtime ? moment(mtime) : null
-                } : null;
-            }).filter(item => item !== null);
+            const newItems = Object.entries(processesInfo).map(([key, { ctime, mtime, process_type }], idx) => ({
+                id: idx,
+                group: idx,
+                title: key,
+                start_time: ctime ? moment(ctime) : null,
+                end_time: mtime ? moment(mtime) : null
+            }));
 
             setGroups(newGroups);
             setItems(newItems);
@@ -58,20 +57,27 @@ const NodeDurationGraph = ({ id }) => {
                     setTimeStart(moment.min(validStartTimes).valueOf());
                     setTimeEnd(moment.max(validEndTimes).valueOf());
                 }
+                else {
+                    // use the current time as the start time
+                    setTimeStart(moment().valueOf());
+                    // use the current time + 1 hour as the end time
+                    setTimeEnd(moment().add(1, 'hour').valueOf());
+                }
                 setInitialLoad(false);
             }
+        } else {
+            setGroups([]);
+            setItems([]);
+            setTimeStart(null);
+            setTimeEnd(null);
         }
     }, [processesInfo]);
 
     const minZoom = 10000; // 10 seconds in milliseconds
     const maxZoom = 365.25 * 24 * 60 * 60 * 1000; // 1 year in milliseconds
 
-    if (!timeStart || !timeEnd) {
-        return <div>Loading timeline...</div>;
-    }
-
     return (
-            <div style={{ padding: '10px', margin: '20px', border: '1px solid #ccc',  }}>
+        <div style={{ padding: '10px', margin: '20px', border: '1px solid #ccc' }}>
             <h1 style={{ textAlign: 'center', color: '#2a3f5f' }}>Node Process Timeline</h1>
             <div style={{textAlign: 'left', fontSize: '16px', color: '#555' }}>
                 <p>
@@ -80,24 +86,50 @@ const NodeDurationGraph = ({ id }) => {
                 <p>
                     Data nodes are shown as rows without bars.
                 </p>
+            </div>
+            <div style={{ margin: '10px' }}>
+    <label>
+        Task:
+        <input
+            type="radio"
+            value="task"
+            checked={useItemType === "task"}
+            onChange={(e) => setUseItemType(e.target.value)}
+        />
+    </label>
+    <label style={{ marginLeft: '20px' }}>
+        Called Process:
+        <input
+            type="radio"
+            value="called_process"
+            checked={useItemType === "called_process"}
+            onChange={(e) => setUseItemType(e.target.value)}
+        />
+    </label>
+</div>
+            {items.length > 0 ? (
+                <Timeline
+                    groups={groups}
+                    items={items}
+                    visibleTimeStart={timeStart}
+                    visibleTimeEnd={timeEnd}
+                    onTimeChange={(visibleTimeStart, visibleTimeEnd, updateScrollCanvas) => {
+                        setTimeStart(visibleTimeStart);
+                        setTimeEnd(visibleTimeEnd);
+                        updateScrollCanvas(visibleTimeStart, visibleTimeEnd);
+                    }}
+                    lineHeight={50}
+                    minZoom={minZoom}
+                    maxZoom={maxZoom}
+                    canMove={false}
+                    canChangeGroup={false}
+                    canResize={'both'}
+                />
+            ) : (
+                <div style={{ textAlign: 'center', color: '#D32F2F', marginTop: '20px', fontSize: '18px', fontWeight: 'bold' }}>
+                    There are no items to display.
                 </div>
-            <Timeline
-                groups={groups}
-                items={items}
-                visibleTimeStart={timeStart}
-                visibleTimeEnd={timeEnd}
-                onTimeChange={(visibleTimeStart, visibleTimeEnd, updateScrollCanvas) => {
-                    setTimeStart(visibleTimeStart);
-                    setTimeEnd(visibleTimeEnd);
-                    updateScrollCanvas(visibleTimeStart, visibleTimeEnd);
-                }}
-                lineHeight={50}
-                minZoom={minZoom}
-                maxZoom={maxZoom}
-                canMove={false}
-                canChangeGroup={false}
-                canResize={'both'}
-            />
+            )}
         </div>
     );
 };