diff --git a/web/app/components/workflow/nodes/assigner/components/var-list/index.tsx b/web/app/components/workflow/nodes/assigner/components/var-list/index.tsx
index d61fc4ca06..ca57b4fd12 100644
--- a/web/app/components/workflow/nodes/assigner/components/var-list/index.tsx
+++ b/web/app/components/workflow/nodes/assigner/components/var-list/index.tsx
@@ -9,7 +9,8 @@ import { AssignerNodeInputType, WriteMode } from '../../types'
 import type { AssignerNodeOperation } from '../../types'
 import ListNoDataPlaceholder from '@/app/components/workflow/nodes/_base/components/list-no-data-placeholder'
 import VarReferencePicker from '@/app/components/workflow/nodes/_base/components/variable/var-reference-picker'
-import type { ValueSelector, Var, VarType } from '@/app/components/workflow/types'
+import type { ValueSelector, Var } from '@/app/components/workflow/types'
+import { VarType } from '@/app/components/workflow/types'
 import { CodeLanguage } from '@/app/components/workflow/nodes/code/types'
 import ActionButton from '@/app/components/base/action-button'
 import Input from '@/app/components/base/input'
@@ -60,16 +61,20 @@ const VarList: FC<Props> = ({
     }
   }, [list, onChange])
 
-  const handleOperationChange = useCallback((index: number) => {
+  const handleOperationChange = useCallback((index: number, varType: VarType) => {
     return (item: { value: string | number }) => {
       const newList = produce(list, (draft) => {
         draft[index].operation = item.value as WriteMode
         draft[index].value = '' // Clear value when operation changes
         if (item.value === WriteMode.set || item.value === WriteMode.increment || item.value === WriteMode.decrement
-          || item.value === WriteMode.multiply || item.value === WriteMode.divide)
+          || item.value === WriteMode.multiply || item.value === WriteMode.divide) {
+          if(varType === VarType.boolean)
+              draft[index].value = false
           draft[index].input_type = AssignerNodeInputType.constant
-        else
+        }
+        else {
           draft[index].input_type = AssignerNodeInputType.variable
+        }
       })
       onChange(newList)
     }
@@ -146,7 +151,7 @@ const VarList: FC<Props> = ({
                   value={item.operation}
                   placeholder='Operation'
                   disabled={!item.variable_selector || item.variable_selector.length === 0}
-                  onSelect={handleOperationChange(index)}
+                  onSelect={handleOperationChange(index, assignedVarType!)}
                   assignedVarType={assignedVarType}
                   writeModeTypes={writeModeTypes}
                   writeModeTypesArr={writeModeTypesArr}
diff --git a/web/app/components/workflow/nodes/assigner/default.ts b/web/app/components/workflow/nodes/assigner/default.ts
index 6341305576..b47750efd7 100644
--- a/web/app/components/workflow/nodes/assigner/default.ts
+++ b/web/app/components/workflow/nodes/assigner/default.ts
@@ -33,7 +33,7 @@ const nodeDefault: NodeDefault<AssignerNodeType> = {
         if (value.operation === WriteMode.set || value.operation === WriteMode.increment
           || value.operation === WriteMode.decrement || value.operation === WriteMode.multiply
           || value.operation === WriteMode.divide) {
-          if (!value.value && typeof value.value !== 'number')
+          if (!value.value && value.value !== false && typeof value.value !== 'number')
             errorMessages = t(`${i18nPrefix}.fieldRequired`, { field: t('workflow.nodes.assigner.variable') })
         }
         else if (!value.value?.length) {
diff --git a/web/app/components/workflow/panel/chat-variable-panel/components/variable-modal.tsx b/web/app/components/workflow/panel/chat-variable-panel/components/variable-modal.tsx
index 2502db05e7..2f2f868acd 100644
--- a/web/app/components/workflow/panel/chat-variable-panel/components/variable-modal.tsx
+++ b/web/app/components/workflow/panel/chat-variable-panel/components/variable-modal.tsx
@@ -148,7 +148,7 @@ const ChatVariableModal = ({
     if (v === ChatVarType.String || v === ChatVarType.Number || v === ChatVarType.Object)
       setEditInJSON(false)
     if(v === ChatVarType.Boolean)
-      setValue(true)
+      setValue(false)
     if (v === ChatVarType.ArrayBoolean)
       setValue([false])
     setType(v)