diff --git a/crates/cli-support/src/js/mod.rs b/crates/cli-support/src/js/mod.rs
index f08bd05190a..1a4f904bf76 100644
--- a/crates/cli-support/src/js/mod.rs
+++ b/crates/cli-support/src/js/mod.rs
@@ -3274,7 +3274,13 @@ __wbg_set_wasm(wasm);"
                 if *optional {
                     writeln!(
                         prelude,
-                        "const result = typeof {js} === 'undefined' ? null : {js};"
+                        "\
+                        let result;
+                        try {{
+                            result = {js};
+                        }} catch (_) {{
+                            result = null;
+                        }}",
                     )
                     .unwrap();
                     Ok("result".to_owned())
diff --git a/crates/cli/tests/reference/static.js b/crates/cli/tests/reference/static.js
index 1f9b56f3b69..86549f8bb6d 100644
--- a/crates/cli/tests/reference/static.js
+++ b/crates/cli/tests/reference/static.js
@@ -39,7 +39,12 @@ export function exported() {
 }
 
 export function __wbg_static_accessor_NAMESPACE_OPTIONAL_c9a4344c544120f4() {
-    const result = typeof test.NAMESPACE_OPTIONAL === 'undefined' ? null : test.NAMESPACE_OPTIONAL;
+    let result;
+    try {
+        result = test.NAMESPACE_OPTIONAL;
+    } catch (_) {
+        result = null;
+    }
     const ret = result;
     return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
 };
@@ -49,8 +54,29 @@ export function __wbg_static_accessor_NAMESPACE_PLAIN_784c8d7f5bbac62a() {
     return ret;
 };
 
+export function __wbg_static_accessor_NESTED_NAMESPACE_OPTIONAL_a414abbeb018a35a() {
+    let result;
+    try {
+        result = test1.test2.NESTED_NAMESPACE_OPTIONAL;
+    } catch (_) {
+        result = null;
+    }
+    const ret = result;
+    return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
+};
+
+export function __wbg_static_accessor_NESTED_NAMESPACE_PLAIN_1121b285cb8479df() {
+    const ret = test1.test2.NESTED_NAMESPACE_PLAIN;
+    return ret;
+};
+
 export function __wbg_static_accessor_OPTIONAL_ade71b6402851d0c() {
-    const result = typeof OPTIONAL === 'undefined' ? null : OPTIONAL;
+    let result;
+    try {
+        result = OPTIONAL;
+    } catch (_) {
+        result = null;
+    }
     const ret = result;
     return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
 };
diff --git a/crates/cli/tests/reference/static.rs b/crates/cli/tests/reference/static.rs
index ea6b37cbc22..4437f550e7d 100644
--- a/crates/cli/tests/reference/static.rs
+++ b/crates/cli/tests/reference/static.rs
@@ -13,6 +13,10 @@ extern "C" {
     static NAMESPACE_PLAIN: JsValue;
     #[wasm_bindgen(thread_local_v2, js_namespace = test)]
     static NAMESPACE_OPTIONAL: Option<Number>;
+    #[wasm_bindgen(thread_local_v2, js_namespace = ["test1", "test2"])]
+    static NESTED_NAMESPACE_PLAIN: JsValue;
+    #[wasm_bindgen(thread_local_v2, js_namespace = ["test1", "test2"])]
+    static NESTED_NAMESPACE_OPTIONAL: Option<Number>;
 }
 
 #[wasm_bindgen]
@@ -21,4 +25,6 @@ pub fn exported() {
     let _ = OPTIONAL.with(Option::clone);
     let _ = NAMESPACE_PLAIN.with(JsValue::clone);
     let _ = NAMESPACE_OPTIONAL.with(Option::clone);
+    let _ = NESTED_NAMESPACE_PLAIN.with(JsValue::clone);
+    let _ = NESTED_NAMESPACE_OPTIONAL.with(Option::clone);
 }
diff --git a/tests/wasm/imports.rs b/tests/wasm/imports.rs
index a6eab0c5e32..119aefef487 100644
--- a/tests/wasm/imports.rs
+++ b/tests/wasm/imports.rs
@@ -90,6 +90,15 @@ extern "C" {
 
     #[wasm_bindgen(js_name = "\"string'literal\nbreakers\r")]
     fn string_literal_breakers() -> u32;
+
+    #[wasm_bindgen(thread_local_v2)]
+    static UNDECLARED: Option<u32>;
+
+    #[wasm_bindgen(thread_local_v2, js_namespace = test)]
+    static UNDECLARED_NAMESPACE: Option<u32>;
+
+    #[wasm_bindgen(thread_local_v2, js_namespace = ["test1", "test2"])]
+    static UNDECLARED_NESTED_NAMESPACE: Option<u32>;
 }
 
 #[wasm_bindgen(module = "tests/wasm/imports_2.js")]
@@ -336,3 +345,10 @@ fn invalid_idents() {
     assert_eq!(kebab_case(), 42);
     assert_eq!(string_literal_breakers(), 42);
 }
+
+#[wasm_bindgen_test]
+fn undeclared() {
+    assert_eq!(UNDECLARED.with(Option::clone), None);
+    assert_eq!(UNDECLARED_NAMESPACE.with(Option::clone), None);
+    assert_eq!(UNDECLARED_NESTED_NAMESPACE.with(Option::clone), None);
+}