diff --git a/src/wasm-lib/kcl/src/std/sketch.rs b/src/wasm-lib/kcl/src/std/sketch.rs
index c2d1518e6..6ef28718d 100644
--- a/src/wasm-lib/kcl/src/std/sketch.rs
+++ b/src/wasm-lib/kcl/src/std/sketch.rs
@@ -995,27 +995,35 @@ async fn start_sketch_on_face(
     args: Args,
 ) -> Result<Box<Face>, KclError> {
     let extrude_plane_id = match tag {
-        SketchOnFaceTag::String(ref s) => extrude_group
-            .value
-            .iter()
-            .find_map(|extrude_surface| match extrude_surface {
-                ExtrudeSurface::ExtrudePlane(extrude_plane) if extrude_plane.name == *s => {
-                    Some(Ok(extrude_plane.face_id))
-                }
-                ExtrudeSurface::ExtrudeArc(extrude_arc) if extrude_arc.name == *s => {
-                    Some(Err(KclError::Type(KclErrorDetails {
-                        message: format!("Cannot sketch on a non-planar surface: `{}`", tag),
-                        source_ranges: vec![args.source_range],
-                    })))
-                }
-                ExtrudeSurface::ExtrudePlane(_) | ExtrudeSurface::ExtrudeArc(_) => None,
-            })
-            .ok_or_else(|| {
-                KclError::Type(KclErrorDetails {
-                    message: format!("Expected a face with the tag `{}`", tag),
+        SketchOnFaceTag::String(ref s) => {
+            if s.is_empty() {
+                return Err(KclError::Type(KclErrorDetails {
+                    message: "Expected a non-empty tag for the face to sketch on".to_string(),
                     source_ranges: vec![args.source_range],
+                }));
+            }
+            extrude_group
+                .value
+                .iter()
+                .find_map(|extrude_surface| match extrude_surface {
+                    ExtrudeSurface::ExtrudePlane(extrude_plane) if extrude_plane.name == *s => {
+                        Some(Ok(extrude_plane.face_id))
+                    }
+                    ExtrudeSurface::ExtrudeArc(extrude_arc) if extrude_arc.name == *s => {
+                        Some(Err(KclError::Type(KclErrorDetails {
+                            message: format!("Cannot sketch on a non-planar surface: `{}`", tag),
+                            source_ranges: vec![args.source_range],
+                        })))
+                    }
+                    ExtrudeSurface::ExtrudePlane(_) | ExtrudeSurface::ExtrudeArc(_) => None,
                 })
-            })??,
+                .ok_or_else(|| {
+                    KclError::Type(KclErrorDetails {
+                        message: format!("Expected a face with the tag `{}`", tag),
+                        source_ranges: vec![args.source_range],
+                    })
+                })??
+        }
         SketchOnFaceTag::StartOrEnd(StartOrEnd::Start) => extrude_group.start_cap_id.ok_or_else(|| {
             KclError::Type(KclErrorDetails {
                 message: "Expected a start face to sketch on".to_string(),
diff --git a/src/wasm-lib/tests/executor/main.rs b/src/wasm-lib/tests/executor/main.rs
index 685809d0a..75f7de614 100644
--- a/src/wasm-lib/tests/executor/main.rs
+++ b/src/wasm-lib/tests/executor/main.rs
@@ -2057,3 +2057,27 @@ const bracket = startSketchOn('XY')
         r#"engine: KclErrorDetails { source_ranges: [SourceRange([1443, 1443])], message: "Modeling command failed: Some([ApiError { error_code: BadRequest, message: \"Fillet failed\" }])" }"#
     );
 }
+
+#[tokio::test(flavor = "multi_thread")]
+async fn serial_test_error_empty_start_sketch_on_string() {
+    let code = r#"const part001 = startSketchOn('-XZ')
+  |> startProfileAt([75.75, 184.25], %)
+  |> line([190.03, -118.13], %)
+  |> line([-33.38, -202.86], %)
+  |> line([-315.86, -64.2], %)
+  |> tangentialArcTo([-147.66, 121.34], %)
+  |> close(%)
+  |> extrude(100, %)
+
+const secondSketch = startSketchOn(part001, '')
+  |> circle([-20, 50], 40, %)
+  |> extrude(20, %)
+"#;
+
+    let result = execute_and_snapshot(code, kcl_lib::settings::types::UnitLength::Mm).await;
+    assert!(result.is_err());
+    assert_eq!(
+        result.err().unwrap().to_string(),
+        r#"type: KclErrorDetails { source_ranges: [SourceRange([272, 298])], message: "Expected a non-empty tag for the face to sketch on" }"#
+    );
+}