diff --git a/frb_codegen/src/library/codegen/parser/hir/tree/parser/crates.rs b/frb_codegen/src/library/codegen/parser/hir/tree/parser/crates.rs
index 1553bc9c43..205d58dda2 100644
--- a/frb_codegen/src/library/codegen/parser/hir/tree/parser/crates.rs
+++ b/frb_codegen/src/library/codegen/parser/hir/tree/parser/crates.rs
@@ -15,7 +15,7 @@ pub(crate) fn parse_crate(
         vis: HirVisibility::Public,
         namespace: crate_name.namespace(),
     };
-    let root_module = parse_module(file.items, info, config)?;
+    let root_module = parse_module(file.items, info, config)?.unwrap();
     Ok(HirTreeCrate {
         name: crate_name.to_owned(),
         root_module,
diff --git a/frb_codegen/src/library/codegen/parser/hir/tree/parser/module.rs b/frb_codegen/src/library/codegen/parser/hir/tree/parser/module.rs
index 8a38203522..e5ffe63b62 100644
--- a/frb_codegen/src/library/codegen/parser/hir/tree/parser/module.rs
+++ b/frb_codegen/src/library/codegen/parser/hir/tree/parser/module.rs
@@ -8,7 +8,7 @@ pub(super) fn parse_module(
     items: Vec<syn::Item>,
     meta: HirTreeModuleMeta,
     config: &ParserHirInternalConfig,
-) -> anyhow::Result<HirTreeModule> {
+) -> anyhow::Result<Option<HirTreeModule>> {
     let mut output_items = vec![];
     let mut output_modules = vec![];
 
@@ -24,11 +24,11 @@ pub(super) fn parse_module(
         }
     }
 
-    Ok(HirTreeModule {
+    Ok(Some(HirTreeModule {
         meta,
         items: output_items,
         modules: output_modules,
-    })
+    }))
 }
 
 fn parse_syn_item_mod(
@@ -43,7 +43,7 @@ fn parse_syn_item_mod(
             vis: (&item_mod.vis).into(),
             namespace: namespace.join(&item_mod.ident.to_string()),
         };
-        Some(parse_module(items, info, config)?)
+        parse_module(items, info, config)?
     } else {
         None
     })