diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 8a329a674b..1183aa665c 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -310,10 +310,14 @@ pub fn (c mut Checker) method_call_expr(method_call_expr mut ast.MethodCallExpr)
 
 pub fn (c mut Checker) selector_expr(selector_expr mut ast.SelectorExpr) table.Type {
 	typ := c.expr(selector_expr.expr)
+	if typ == table.void_type_idx {
+		c.error('unknown selector expression', selector_expr.pos)
+		return table.void_type
+	}
 	selector_expr.expr_type = typ
-	// if selector_expr.field == 'size' {
-	// println('sel expr line_nr=$selector_expr.pos.line_nr typ=$selector_expr.expr_type')
-	// }
+	if selector_expr.field == 'size' {
+		println('sel expr line_nr=$selector_expr.pos.line_nr typ=$selector_expr.expr_type')
+	}
 	typ_sym := c.table.get_type_symbol(typ)
 	field_name := selector_expr.field
 	if field := typ_sym.find_field(field_name) {
diff --git a/vlib/v/gen/tests/3.c b/vlib/v/gen/tests/3.c
index 470b125825..91c18fddce 100644
--- a/vlib/v/gen/tests/3.c
+++ b/vlib/v/gen/tests/3.c
@@ -5,6 +5,13 @@ struct User {
 
 // multi return structs
 // end of definitions #endif
+
+void User_foo(User* u);
+
+void User_foo(User* u) {
+	int age = u->age;
+}
+
 int main() {
 	User user = (User){
 };
diff --git a/vlib/v/gen/tests/3.vv b/vlib/v/gen/tests/3.vv
index ede302921b..2caaa1b963 100644
--- a/vlib/v/gen/tests/3.vv
+++ b/vlib/v/gen/tests/3.vv
@@ -3,6 +3,10 @@ struct User {
 	name string
 }
 
+fn (u &User) foo() {
+	age := u.age
+}
+
 fn main() {
 	user := User{}
 	user.age = 10