diff --git a/core/expression/src/parser/standard/mod.rs b/core/expression/src/parser/standard/mod.rs
index f3335bef..72d77122 100644
--- a/core/expression/src/parser/standard/mod.rs
+++ b/core/expression/src/parser/standard/mod.rs
@@ -253,7 +253,7 @@ where
             Arity::Dual => {
                 let arg1 = self.parse_expression(0)?;
                 self.iterator.expect(TokenKind::Operator, Some(&[","]))?;
-                let arg2 = self.parse_primary_expression()?;
+                let arg2 = self.parse_expression(0)?;
                 self.iterator.expect(TokenKind::Bracket, Some(&[")"]))?;
 
                 self.iterator.node(Node::BuiltIn {
diff --git a/core/expression/tests/isolate.rs b/core/expression/tests/isolate.rs
index 948e8a69..0892eedf 100644
--- a/core/expression/tests/isolate.rs
+++ b/core/expression/tests/isolate.rs
@@ -519,6 +519,27 @@ fn isolate_standard_test() {
                 },
             ]),
         },
+        TestEnv {
+            env: json!({}),
+            cases: Vec::from([
+                TestCase {
+                    expr: r#"some(['a', 'b'], startsWith('a', #))"#,
+                    result: json!(true),
+                },
+                TestCase {
+                    expr: r#"some(['a', 'b'], startsWith(#, 'a'))"#,
+                    result: json!(true),
+                },
+                TestCase {
+                    expr: r#"some(['a', 'b'], startsWith('c', #))"#,
+                    result: json!(false),
+                },
+                TestCase {
+                    expr: r#"some(['a', 'b'], startsWith(#, 'c'))"#,
+                    result: json!(false),
+                },
+            ]),
+        },
     ]);
 
     let isolate = Isolate::default();