diff --git a/kclvm/sema/src/resolver/global.rs b/kclvm/sema/src/resolver/global.rs
index dfd766793..10284fb6e 100644
--- a/kclvm/sema/src/resolver/global.rs
+++ b/kclvm/sema/src/resolver/global.rs
@@ -760,7 +760,7 @@ impl<'ctx> Resolver<'ctx> {
                 params.push(Parameter {
                     name,
                     ty: ty.clone(),
-                    has_default: args.node.defaults.get(i).is_some(),
+                    has_default: args.node.defaults.get(i).map_or(false, |arg| arg.is_some()),
                 });
             }
         }
diff --git a/kclvm/sema/src/resolver/test_data/kcl.mod b/kclvm/sema/src/resolver/test_data/kcl.mod
index e69de29bb..c51d42cae 100644
--- a/kclvm/sema/src/resolver/test_data/kcl.mod
+++ b/kclvm/sema/src/resolver/test_data/kcl.mod
@@ -0,0 +1,2 @@
+[package]
+
diff --git a/kclvm/sema/src/resolver/test_data/schema_params_miss.k b/kclvm/sema/src/resolver/test_data/schema_params_miss.k
new file mode 100644
index 000000000..4c8c7d387
--- /dev/null
+++ b/kclvm/sema/src/resolver/test_data/schema_params_miss.k
@@ -0,0 +1,6 @@
+schema D[name: str]: # ''
+    n: str = name
+
+d = D() { # expected 1 positional argument, found 0
+    n = ""
+}
\ No newline at end of file
diff --git a/kclvm/sema/src/resolver/tests.rs b/kclvm/sema/src/resolver/tests.rs
index 805fae547..0bab904f9 100644
--- a/kclvm/sema/src/resolver/tests.rs
+++ b/kclvm/sema/src/resolver/tests.rs
@@ -719,3 +719,27 @@ fn undef_lambda_param() {
         )
     );
 }
+
+#[test]
+fn test_schema_params_count() {
+    let sess = Arc::new(ParseSession::default());
+    let mut program = load_program(
+        sess.clone(),
+        &["./src/resolver/test_data/schema_params_miss.k"],
+        None,
+        None,
+    )
+    .unwrap();
+    let scope = resolve_program(&mut program);
+    assert_eq!(scope.handler.diagnostics.len(), 1);
+    let diag = &scope.handler.diagnostics[0];
+    assert_eq!(
+        diag.code,
+        Some(DiagnosticId::Error(ErrorKind::CompileError))
+    );
+    assert_eq!(diag.messages.len(), 1);
+    assert_eq!(
+        diag.messages[0].message,
+        "expected 1 positional argument, found 0"
+    );
+}