diff --git a/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.expect.md b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.expect.md
index 37376a1c1f..1ebf15e389 100644
--- a/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.expect.md
+++ b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.expect.md
@@ -9,7 +9,7 @@ function Component(a) {
   let obj = {
     method() {
       mutate(x);
-      return x.a;
+      return x;
     },
   };
   return obj.method();
@@ -32,7 +32,7 @@ function Component(a) {
   const obj = {
     method() {
       mutate(x);
-      return x.a;
+      return x;
     },
   };
   return obj.method();
diff --git a/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.js b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.js
index 4222e39846..54c1edf116 100644
--- a/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.js
+++ b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/object-method-shorthand-3.js
@@ -5,7 +5,7 @@ function Component(a) {
   let obj = {
     method() {
       mutate(x);
-      return x.a;
+      return x;
     },
   };
   return obj.method();
diff --git a/compiler/packages/sprout/src/shared-runtime.ts b/compiler/packages/sprout/src/shared-runtime.ts
index 56cb5eaa08..752b1f590e 100644
--- a/compiler/packages/sprout/src/shared-runtime.ts
+++ b/compiler/packages/sprout/src/shared-runtime.ts
@@ -34,11 +34,21 @@ export const CONST_NUMBER2 = 2;
 export const CONST_TRUE = true;
 export const CONST_FALSE = false;
 
-let count: number = 0;
 export function mutate(arg: any): void {
   // don't mutate primitive
-  if (typeof arg != null && typeof arg === "object") {
-    arg["wat" + count++] = "joe";
+  if (typeof arg === null || typeof arg !== "object") {
+    return;
+  }
+
+  let count: number = 0;
+  let key;
+  while (true) {
+    key = "wat" + count;
+    if (!Object.hasOwn(arg, key)) {
+      arg[key] = "joe";
+      return;
+    }
+    count++;
   }
 }