diff --git a/web/app/components/workflow/nodes/_base/hooks/use-one-step-run.ts b/web/app/components/workflow/nodes/_base/hooks/use-one-step-run.ts
index 2bcfc3eab9..dcddb9829c 100644
--- a/web/app/components/workflow/nodes/_base/hooks/use-one-step-run.ts
+++ b/web/app/components/workflow/nodes/_base/hooks/use-one-step-run.ts
@@ -80,7 +80,7 @@ const useOneStepRun = <T>({
   moreDataForCheckValid,
 }: Params<T>) => {
   const { t } = useTranslation()
-  const { getBeforeNodesInSameBranch } = useWorkflow()
+  const { getBeforeNodesInSameBranch } = useWorkflow() as any
   const isChatMode = useIsChatMode()
 
   const allOutputVars = toNodeOutputVars(getBeforeNodesInSameBranch(id), isChatMode)
diff --git a/web/app/components/workflow/nodes/question-classifier/default.ts b/web/app/components/workflow/nodes/question-classifier/default.ts
index a8af8be940..a059401e0e 100644
--- a/web/app/components/workflow/nodes/question-classifier/default.ts
+++ b/web/app/components/workflow/nodes/question-classifier/default.ts
@@ -3,6 +3,8 @@ import { BlockEnum } from '../../types'
 import type { QuestionClassifierNodeType } from './types'
 import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/constants'
 
+const i18nPrefix = 'workflow'
+
 const nodeDefault: NodeDefault<QuestionClassifierNodeType> = {
   defaultValue: {
     query_variable_selector: [],
@@ -26,15 +28,19 @@ const nodeDefault: NodeDefault<QuestionClassifierNodeType> = {
     const nodes = isChatMode ? ALL_CHAT_AVAILABLE_BLOCKS : ALL_COMPLETION_AVAILABLE_BLOCKS
     return nodes.filter(type => type !== BlockEnum.VariableAssigner)
   },
-  checkValid(payload: QuestionClassifierNodeType) {
-    let isValid = true
+  checkValid(payload: QuestionClassifierNodeType, t: any) {
     let errorMessages = ''
-    if (payload.type) {
-      isValid = true
-      errorMessages = ''
-    }
+    if (!errorMessages && (!payload.query_variable_selector || payload.query_variable_selector.length === 0))
+      errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.nodes.questionClassifiers.inputVars`) })
+
+    if (!errorMessages && !payload.model.provider)
+      errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.nodes.questionClassifiers.model`) })
+
+    if (!errorMessages && (!payload.classes || payload.classes.length === 0))
+      errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.nodes.questionClassifiers.class`) })
+
     return {
-      isValid,
+      isValid: !errorMessages,
       errorMessage: errorMessages,
     }
   },
diff --git a/web/app/components/workflow/nodes/question-classifier/panel.tsx b/web/app/components/workflow/nodes/question-classifier/panel.tsx
index 95bafb0ac8..6c8126b4f7 100644
--- a/web/app/components/workflow/nodes/question-classifier/panel.tsx
+++ b/web/app/components/workflow/nodes/question-classifier/panel.tsx
@@ -56,6 +56,7 @@ const Panel: FC<NodePanelProps<QuestionClassifierNodeType>> = ({
             value={inputs.query_variable_selector}
             onChange={handleQueryVarChange}
             filterVar={filterVar}
+            width={387}
           />
         </Field>
         <Field