diff --git a/backend/domain/workflow/internal/canvas/convert/type_convert.go b/backend/domain/workflow/internal/canvas/convert/type_convert.go
index 8535aa486d..b2e84381cb 100644
--- a/backend/domain/workflow/internal/canvas/convert/type_convert.go
+++ b/backend/domain/workflow/internal/canvas/convert/type_convert.go
@@ -63,7 +63,11 @@ func CanvasVariableToTypeInfo(v *vo.Variable) (*vo.TypeInfo, error) {
 		tInfo.Type = vo.DataTypeObject
 		tInfo.Properties = make(map[string]*vo.TypeInfo)
 		if v.Schema != nil {
-			for _, subVAny := range v.Schema.([]any) {
+			schemaList, ok := v.Schema.([]any)
+			if !ok {
+				return nil, fmt.Errorf("object schema must be []any, got %T", v.Schema)
+			}
+			for _, subVAny := range schemaList {
 				subV, err := vo.ParseVariable(subVAny)
 				if err != nil {
 					return nil, err
@@ -134,7 +138,11 @@ func CanvasBlockInputToTypeInfo(b *vo.BlockInput) (tInfo *vo.TypeInfo, err error
 		tInfo.Type = vo.DataTypeObject
 		tInfo.Properties = make(map[string]*vo.TypeInfo)
 		if b.Schema != nil {
-			for _, subVAny := range b.Schema.([]any) {
+			schemaList, ok := b.Schema.([]any)
+			if !ok {
+				return nil, fmt.Errorf("object schema must be []any, got %T", b.Schema)
+			}
+			for _, subVAny := range schemaList {
 				if b.Value.Type == vo.BlockInputValueTypeRef {
 					subV, err := vo.ParseVariable(subVAny)
 					if err != nil {
@@ -602,8 +610,12 @@ func BlockInputToNamedTypeInfo(name string, b *vo.BlockInput) (*vo.NamedTypeInfo
 	case vo.VariableTypeObject:
 		tInfo.Type = vo.DataTypeObject
 		if b.Schema != nil {
-			tInfo.Properties = make([]*vo.NamedTypeInfo, 0, len(b.Schema.([]any)))
-			for _, subVAny := range b.Schema.([]any) {
+			schemaList, ok := b.Schema.([]any)
+			if !ok {
+				return nil, fmt.Errorf("object schema must be []any, got %T", b.Schema)
+			}
+			tInfo.Properties = make([]*vo.NamedTypeInfo, 0, len(schemaList))
+			for _, subVAny := range schemaList {
 				if b.Value.Type == vo.BlockInputValueTypeRef {
 					subV, err := vo.ParseVariable(subVAny)
 					if err != nil {
@@ -678,8 +690,12 @@ func VariableToNamedTypeInfo(v *vo.Variable) (*vo.NamedTypeInfo, error) {
 	case vo.VariableTypeObject:
 		nInfo.Type = vo.DataTypeObject
 		if v.Schema != nil {
+			schemaList, ok := v.Schema.([]any)
+			if !ok {
+				return nil, fmt.Errorf("object schema must be []any, got %T", v.Schema)
+			}
 			nInfo.Properties = make([]*vo.NamedTypeInfo, 0)
-			for _, subVAny := range v.Schema.([]any) {
+			for _, subVAny := range schemaList {
 				subV, err := vo.ParseVariable(subVAny)
 				if err != nil {
 					return nil, err
diff --git a/backend/domain/workflow/internal/canvas/convert/type_convert_test.go b/backend/domain/workflow/internal/canvas/convert/type_convert_test.go
new file mode 100644
index 0000000000..c33674f0b4
--- /dev/null
+++ b/backend/domain/workflow/internal/canvas/convert/type_convert_test.go
@@ -0,0 +1,178 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package convert
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coze-dev/coze-studio/backend/domain/workflow/entity/vo"
+)
+
+func TestCanvasVariableToTypeInfo_ObjectSchemaTypeAssertion(t *testing.T) {
+	t.Run("schema is []any - should succeed", func(t *testing.T) {
+		v := &vo.Variable{
+			Type: vo.VariableTypeObject,
+			Schema: []any{
+				map[string]any{
+					"name": "field1",
+					"type": vo.VariableTypeString,
+				},
+			},
+		}
+		tInfo, err := CanvasVariableToTypeInfo(v)
+		assert.NoError(t, err)
+		assert.Equal(t, vo.DataTypeObject, tInfo.Type)
+		assert.NotNil(t, tInfo.Properties)
+	})
+
+	t.Run("schema is map[string]any - should return error instead of panic", func(t *testing.T) {
+		v := &vo.Variable{
+			Type:   vo.VariableTypeObject,
+			Schema: map[string]any{"key": "value"}, // Invalid schema type
+		}
+
+		tInfo, err := CanvasVariableToTypeInfo(v)
+		assert.Error(t, err)
+		assert.Nil(t, tInfo)
+		assert.Contains(t, err.Error(), "object schema must be []any")
+	})
+
+	t.Run("schema is nil - should succeed", func(t *testing.T) {
+		v := &vo.Variable{
+			Type:   vo.VariableTypeObject,
+			Schema: nil,
+		}
+		tInfo, err := CanvasVariableToTypeInfo(v)
+		assert.NoError(t, err)
+		assert.Equal(t, vo.DataTypeObject, tInfo.Type)
+	})
+
+	t.Run("schema is string - should return error", func(t *testing.T) {
+		v := &vo.Variable{
+			Type:   vo.VariableTypeObject,
+			Schema: "invalid",
+		}
+		tInfo, err := CanvasVariableToTypeInfo(v)
+		assert.Error(t, err)
+		assert.Nil(t, tInfo)
+	})
+}
+
+func TestCanvasBlockInputToTypeInfo_ObjectSchemaTypeAssertion(t *testing.T) {
+	t.Run("schema is []any - should succeed", func(t *testing.T) {
+		b := &vo.BlockInput{
+			Type: vo.VariableTypeObject,
+			Value: &vo.BlockInputValue{
+				Type: vo.BlockInputValueTypeRef,
+			},
+			Schema: []any{
+				map[string]any{
+					"name": "field1",
+					"type": vo.VariableTypeString,
+				},
+			},
+		}
+		tInfo, err := CanvasBlockInputToTypeInfo(b)
+		assert.NoError(t, err)
+		assert.Equal(t, vo.DataTypeObject, tInfo.Type)
+	})
+
+	t.Run("schema is map[string]any - should return error instead of panic", func(t *testing.T) {
+		b := &vo.BlockInput{
+			Type: vo.VariableTypeObject,
+			Value: &vo.BlockInputValue{
+				Type: vo.BlockInputValueTypeRef,
+			},
+			Schema: map[string]any{"key": "value"}, // Invalid schema type
+		}
+
+		tInfo, err := CanvasBlockInputToTypeInfo(b)
+		assert.Error(t, err)
+		assert.Nil(t, tInfo)
+		assert.Contains(t, err.Error(), "object schema must be []any")
+	})
+}
+
+func TestVariableToNamedTypeInfo_ObjectSchemaTypeAssertion(t *testing.T) {
+	t.Run("schema is []any - should succeed", func(t *testing.T) {
+		v := &vo.Variable{
+			Name: "testVar",
+			Type: vo.VariableTypeObject,
+			Schema: []any{
+				map[string]any{
+					"name": "field1",
+					"type": vo.VariableTypeString,
+				},
+			},
+		}
+		nInfo, err := VariableToNamedTypeInfo(v)
+		assert.NoError(t, err)
+		assert.Equal(t, vo.DataTypeObject, nInfo.Type)
+		assert.Equal(t, "testVar", nInfo.Name)
+	})
+
+	t.Run("schema is map[string]any - should return error instead of panic", func(t *testing.T) {
+		v := &vo.Variable{
+			Name:   "testVar",
+			Type:   vo.VariableTypeObject,
+			Schema: map[string]any{"key": "value"}, // Invalid schema type
+		}
+
+		nInfo, err := VariableToNamedTypeInfo(v)
+		assert.Error(t, err)
+		assert.Nil(t, nInfo)
+		assert.Contains(t, err.Error(), "object schema must be []any")
+	})
+}
+
+func TestBlockInputToNamedTypeInfo_ObjectSchemaTypeAssertion(t *testing.T) {
+	t.Run("schema is []any - should succeed", func(t *testing.T) {
+		b := &vo.BlockInput{
+			Type: vo.VariableTypeObject,
+			Value: &vo.BlockInputValue{
+				Type: vo.BlockInputValueTypeRef,
+			},
+			Schema: []any{
+				map[string]any{
+					"name": "field1",
+					"type": vo.VariableTypeString,
+				},
+			},
+		}
+		nInfo, err := BlockInputToNamedTypeInfo("testField", b)
+		assert.NoError(t, err)
+		assert.Equal(t, vo.DataTypeObject, nInfo.Type)
+		assert.Equal(t, "testField", nInfo.Name)
+	})
+
+	t.Run("schema is map[string]any - should return error instead of panic", func(t *testing.T) {
+		b := &vo.BlockInput{
+			Type: vo.VariableTypeObject,
+			Value: &vo.BlockInputValue{
+				Type: vo.BlockInputValueTypeRef,
+			},
+			Schema: map[string]any{"key": "value"}, // Invalid schema type
+		}
+
+		nInfo, err := BlockInputToNamedTypeInfo("testField", b)
+		assert.Error(t, err)
+		assert.Nil(t, nInfo)
+		assert.Contains(t, err.Error(), "object schema must be []any")
+	})
+}
\ No newline at end of file