diff --git a/ecmascript/compiler/builtins/builtins_array_stub_builder.cpp b/ecmascript/compiler/builtins/builtins_array_stub_builder.cpp
index 81ce3b244e876fe0fc9a3625b3602aed54bd3c44..735e34197165d294b8bee2784c0e1c4b9566b3a8 100644
--- a/ecmascript/compiler/builtins/builtins_array_stub_builder.cpp
+++ b/ecmascript/compiler/builtins/builtins_array_stub_builder.cpp
@@ -5284,7 +5284,11 @@ void BuiltinsArrayStubBuilder::FlatMap(GateRef glue, GateRef thisValue, GateRef
                         BRANCH(TaggedIsHeapObject(retValue), &retValueIsHeapObject, &loopEnd);
                         Bind(&retValueIsHeapObject);
                         {
-                            BRANCH_NO_WEIGHT(IsJsArray(glue, retValue), &retValueIsJsArray, &loopEnd);
+                            Label checkProxy(env);
+                            Label notProxy(env);
+                            BRANCH_NO_WEIGHT(IsJsArray(glue, retValue), &retValueIsJsArray, &checkProxy);
+                            Bind(&checkProxy);
+                            BRANCH_UNLIKELY(IsJsProxy(glue, retValue), slowPath, &loopEnd);
                         }
                         Bind(&retValueIsJsArray);
                         {
diff --git a/test/moduletest/arrayflatmap/arrayflatmap.js b/test/moduletest/arrayflatmap/arrayflatmap.js
index 372ee0891f421654f50ac25af9f4c7ccc9b2d59c..2df83ff2f2ac7fc96c4ed4f04c234dd360bc2712 100644
--- a/test/moduletest/arrayflatmap/arrayflatmap.js
+++ b/test/moduletest/arrayflatmap/arrayflatmap.js
@@ -85,4 +85,12 @@ let res = arr.flatMap((x)=>{
 print(res);
 print(res.length)
 
-
+{
+    let arr1 = [0, 1];
+    let arr2 = [1, 2];
+    let proxy1 = new Proxy(arr1, {});
+    let proxy2 = new Proxy(arr2, {});
+    let arr3 = [proxy1, proxy2];
+    let res = arr3.flatMap(x=>x);
+    print(res[0]);
+}
diff --git a/test/moduletest/arrayflatmap/expect_output.txt b/test/moduletest/arrayflatmap/expect_output.txt
index d48a4bf50308d0c508466bd1eaba259aca821fa0..137001033a0e074d2d8713268173dd3b63bce234 100644
--- a/test/moduletest/arrayflatmap/expect_output.txt
+++ b/test/moduletest/arrayflatmap/expect_output.txt
@@ -20,3 +20,4 @@ true
 1,1,1,3,9,4,16,5,25
 1,2,3,4,5,6,7,8
 8
+0
\ No newline at end of file