feat: Capture task executor null value exception #3409 (#3468)

### What problem does this PR solve?

feat: Capture task executor null value exception #3409

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/user-setting/setting-system/task-bar-chat.tsx

     const firstItem = data[0];
     const lastItem = data[data.length - 1];
 
-    const domain = [firstItem.now, lastItem.now];
-
+    const domain = [firstItem?.now, lastItem?.now];
     return (
       <Flex key={key} className={styles.taskBar} vertical>
         <div className="flex gap-8">
           <b className={styles.taskBarTitle}>ID: {key}</b>
-          <b className={styles.taskBarTitle}>Lag: {lastItem.lag}</b>
-          <b className={styles.taskBarTitle}>Pending: {lastItem.pending}</b>
+          <b className={styles.taskBarTitle}>Lag: {lastItem?.lag}</b>
+          <b className={styles.taskBarTitle}>Pending: {lastItem?.pending}</b>
         </div>
         <ResponsiveContainer>
           <BarChart data={data}>