diff --git a/src/backend/binaryen/wasm_expr_gen.ts b/src/backend/binaryen/wasm_expr_gen.ts
index 2a4f51fd..3f1c1f3c 100644
--- a/src/backend/binaryen/wasm_expr_gen.ts
+++ b/src/backend/binaryen/wasm_expr_gen.ts
@@ -3924,14 +3924,24 @@ export class WASMExpressionGen {
                 return module.f64.const(0);
             }
             case ValueTypeKind.STRING: {
-                return FunctionalFuncs.generateStringForStructArrayStr(
-                    this.module,
-                    '',
-                );
+                if (getConfig().enableStringRef) {
+                    return this.createStringRef('');
+                } else {
+                    return FunctionalFuncs.generateStringForStructArrayStr(
+                        this.module,
+                        '',
+                    );
+                }
             }
             case ValueTypeKind.BOOLEAN: {
                 return module.i32.const(0);
             }
+            case ValueTypeKind.FUNCTION: {
+                return binaryenCAPI._BinaryenRefNull(
+                    module.ptr,
+                    builtinClosureType.typeRef,
+                );
+            }
             default: {
                 return binaryenCAPI._BinaryenRefNull(
                     module.ptr,
diff --git a/tests/samples/assign_different_type.ts b/tests/samples/assign_different_type.ts
new file mode 100644
index 00000000..403b293d
--- /dev/null
+++ b/tests/samples/assign_different_type.ts
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2023 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+class A{
+    x: string[];
+    constructor(){
+        this.x = [];
+    }
+}
+
+export function assignStringArray() {
+    const a = new A();
+    a.x.push('hello');
+    console.log(a.x[0]);
+}
+
+interface I {
+    instance: number;
+}
+
+type cbType = (v: I) => number;
+
+class B {
+    x: Array<cbType>;
+    constructor() {
+        this.x = [];
+    }
+}
+
+function elemFunc(a: I) {
+    return a.instance;
+}
+
+export function assignClosureArray() {
+    const a = new B();
+    const i: I = {
+        instance: 100,
+    };
+    a.x.push(elemFunc);
+    console.log(a.x[0](i));
+}
diff --git a/tools/validate/wamr/validation.json b/tools/validate/wamr/validation.json
index e4f91c5e..8d7db695 100644
--- a/tools/validate/wamr/validation.json
+++ b/tools/validate/wamr/validation.json
@@ -3719,6 +3719,21 @@
             }
         ]
     },
+    {
+        "module": "assign_different_type",
+        "entries": [
+            {
+                "name": "assignStringArray",
+                "args": [],
+                "result": "hello"
+            },
+            {
+                "name": "assignClosureArray",
+                "args": [],
+                "result": "100"
+            }
+        ]
+    },
     {
         "module": "auto_box_unbox",
         "entries": [