diff --git a/web/app/components/app/workflow-log/__tests__/evaluation-cell.spec.tsx b/web/app/components/app/workflow-log/__tests__/evaluation-cell.spec.tsx
index e51ffdaaac..a8af664416 100644
--- a/web/app/components/app/workflow-log/__tests__/evaluation-cell.spec.tsx
+++ b/web/app/components/app/workflow-log/__tests__/evaluation-cell.spec.tsx
@@ -15,6 +15,20 @@ describe('EvaluationCell', () => {
       expect(screen.queryByRole('button', { name: 'appLog.table.header.evaluation' })).not.toBeInTheDocument()
     })
 
+    it('should render a placeholder when evaluation data is missing', () => {
+      render(<EvaluationCell />)
+
+      expect(screen.getByText('-')).toBeInTheDocument()
+      expect(screen.queryByRole('button', { name: 'appLog.table.header.evaluation' })).not.toBeInTheDocument()
+    })
+
+    it('should render a placeholder when evaluation data is null', () => {
+      render(<EvaluationCell evaluation={null} />)
+
+      expect(screen.getByText('-')).toBeInTheDocument()
+      expect(screen.queryByRole('button', { name: 'appLog.table.header.evaluation' })).not.toBeInTheDocument()
+    })
+
     it('should render a trigger button when evaluation data is available', () => {
       render(
         <EvaluationCell
diff --git a/web/app/components/app/workflow-log/evaluation-cell.tsx b/web/app/components/app/workflow-log/evaluation-cell.tsx
index 5ccfb2e55b..36dac1a6df 100644
--- a/web/app/components/app/workflow-log/evaluation-cell.tsx
+++ b/web/app/components/app/workflow-log/evaluation-cell.tsx
@@ -13,7 +13,7 @@ import { getEvaluationNodeBlockType } from '@/app/components/evaluation/componen
 import BlockIcon from '@/app/components/workflow/block-icon'
 
 type EvaluationCellProps = {
-  evaluation: EvaluationLogItem[]
+  evaluation?: EvaluationLogItem[] | null
 }
 
 const formatEvaluationValue = (value: EvaluationLogItem['value']) => {
@@ -28,8 +28,9 @@ const EvaluationCell = ({
 }: EvaluationCellProps) => {
   const { t } = useTranslation()
   const [open, setOpen] = useState(false)
+  const evaluationItems = evaluation ?? []
 
-  if (!evaluation.length) {
+  if (!evaluationItems.length) {
     return (
       <div className="flex items-center justify-center px-2 py-3 system-sm-regular text-text-quaternary">
         -
@@ -61,12 +62,12 @@ const EvaluationCell = ({
         popupClassName="w-[320px] overflow-hidden rounded-xl border-[0.5px] border-components-panel-border p-0 shadow-[0px_12px_16px_-4px_rgba(9,9,11,0.08),0px_4px_6px_-2px_rgba(9,9,11,0.03)]"
       >
         <div data-testid="workflow-log-evaluation-popover" className="max-h-[320px] overflow-y-auto bg-components-panel-bg">
-          {evaluation.map((item, index) => (
+          {evaluationItems.map((item, index) => (
             <div
               key={item.nodeInfo ? `${item.name}-${item.nodeInfo.node_id}` : item.name}
               className={cn(
                 'grid grid-cols-[minmax(0,1fr)_auto] gap-3 px-4 py-3',
-                index !== evaluation.length - 1 && 'border-b border-divider-subtle',
+                index !== evaluationItems.length - 1 && 'border-b border-divider-subtle',
               )}
             >
               <div className="min-w-0">
diff --git a/web/models/log.ts b/web/models/log.ts
index 93a9f322b4..2a63c7b3dd 100644
--- a/web/models/log.ts
+++ b/web/models/log.ts
@@ -275,7 +275,7 @@ export type WorkflowAppLogDetail = {
   created_by_end_user?: EndUserInfo
   created_at: number
   read_at?: number
-  evaluation: EvaluationLogItem[]
+  evaluation?: EvaluationLogItem[] | null
 }
 export type WorkflowLogsResponse = {
   data: Array<WorkflowAppLogDetail>