diff --git a/compiler/forget/packages/babel-plugin-react-forget/src/HIR/BuildHIR.ts b/compiler/forget/packages/babel-plugin-react-forget/src/HIR/BuildHIR.ts
index dcb36b25c0..3763708c77 100644
--- a/compiler/forget/packages/babel-plugin-react-forget/src/HIR/BuildHIR.ts
+++ b/compiler/forget/packages/babel-plugin-react-forget/src/HIR/BuildHIR.ts
@@ -1790,10 +1790,15 @@ function lowerExpression(
         builder,
         expr.node.loc ?? GeneratedSource
       );
-      const identifier = lowerIdentifier(
+      const identifier = lowerIdentifierForAssignment(
         builder,
+        argument.node.loc ?? GeneratedSource,
+        InstructionKind.Reassign,
         argument as NodePath<t.Identifier>
       );
+      if (identifier === null) {
+        return { kind: "UnsupportedNode", node: exprNode, loc: exprLoc };
+      }
       builder.push({
         id: makeInstructionId(0),
         lvalue: { ...temp },
diff --git a/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.mutate-global-increment-op-invalid-react.expect.md b/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.mutate-global-increment-op-invalid-react.expect.md
new file mode 100644
index 0000000000..260365eb2c
--- /dev/null
+++ b/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.mutate-global-increment-op-invalid-react.expect.md
@@ -0,0 +1,21 @@
+
+## Input
+
+```javascript
+let renderCount = 0;
+
+function NoHooks() {
+  renderCount++;
+  return <div />;
+}
+
+```
+
+
+## Error
+
+```
+[ReactForget] InvalidReact: This reassigns a variable which was not defined inside of the component. Components should be pure and side-effect free. If this variable is used in rendering, use useState instead. (https://react.dev/learn/keeping-components-pure) (4:4)
+```
+          
+      
\ No newline at end of file
diff --git a/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mutate-global-increment-op-invalid-react.js b/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.mutate-global-increment-op-invalid-react.js
similarity index 100%
rename from compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mutate-global-increment-op-invalid-react.js
rename to compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.mutate-global-increment-op-invalid-react.js
diff --git a/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mutate-global-increment-op-invalid-react.expect.md b/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mutate-global-increment-op-invalid-react.expect.md
deleted file mode 100644
index 0f8b811533..0000000000
--- a/compiler/forget/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mutate-global-increment-op-invalid-react.expect.md
+++ /dev/null
@@ -1,33 +0,0 @@
-
-## Input
-
-```javascript
-let renderCount = 0;
-
-function NoHooks() {
-  renderCount++;
-  return <div />;
-}
-
-```
-
-## Code
-
-```javascript
-import { unstable_useMemoCache as useMemoCache } from "react";
-let renderCount = 0;
-
-function NoHooks() {
-  const $ = useMemoCache(1);
-  let t0;
-  if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
-    t0 = <div />;
-    $[0] = t0;
-  } else {
-    t0 = $[0];
-  }
-  return t0;
-}
-
-```
-      
\ No newline at end of file