diff --git a/src/debugger/call_stack.rs b/src/debugger/call_stack.rs
index 82d193b..8af5cff 100644
--- a/src/debugger/call_stack.rs
+++ b/src/debugger/call_stack.rs
@@ -94,52 +94,52 @@ impl CallStack {
 
     fn build_stack_frame(&self, ctx: &Context, statement_idx: StatementIdx) -> StackFrame {
         let id = MIN_OBJECT_REFERENCE + 2 * self.call_ids.len() as i64;
+        let Some(CodeLocation(source_file, code_span, _)) =
+            ctx.code_location_for_statement_idx(statement_idx)
+        else {
+            return unknown_frame();
+        };
 
-        match ctx.code_location_for_statement_idx(statement_idx) {
-            Some(CodeLocation(source_file, code_span, _)) => {
-                let file_path = Path::new(&source_file.0);
-                let name = ctx
-                    .function_name_for_statement_idx(statement_idx)
-                    .map(|name| name.0)
-                    .unwrap_or("test".to_string());
-
-                let is_user_code = file_path.starts_with(&ctx.root_path);
-                let presentation_hint = Some(if is_user_code {
-                    StackFramePresentationhint::Normal
-                } else {
-                    StackFramePresentationhint::Subtle
-                });
-
-                // Annotations from debug info are 0-indexed.
-                // UI expects 1-indexed, hence +1 below.
-                let line = (code_span.start.line.0 + 1) as i64;
-                let column = (code_span.start.col.0 + 1) as i64;
-
-                StackFrame {
-                    id,
-                    name,
-                    source: Some(Source {
-                        name: None,
-                        path: Some(source_file.0),
-                        ..Default::default()
-                    }),
-                    line,
-                    column,
-                    presentation_hint,
-                    ..Default::default()
-                }
-            }
-            None => StackFrame {
-                id,
-                name: "Unknown".to_string(),
-                line: 1,
-                column: 1,
-                presentation_hint: Some(StackFramePresentationhint::Subtle),
-                ..Default::default()
-            },
+        let file_path = Path::new(&source_file.0);
+        let name = ctx
+            .function_name_for_statement_idx(statement_idx)
+            .map(|name| name.0)
+            .unwrap_or("test".to_string());
+
+        let is_user_code = file_path.starts_with(&ctx.root_path);
+        let presentation_hint = Some(if is_user_code {
+            StackFramePresentationhint::Normal
+        } else {
+            StackFramePresentationhint::Subtle
+        });
+
+        // Annotations from debug info are 0-indexed.
+        // UI expects 1-indexed, hence +1 below.
+        let line = (code_span.start.line.0 + 1) as i64;
+        let column = (code_span.start.col.0 + 1) as i64;
+
+        StackFrame {
+            id,
+            name,
+            source: Some(Source { name: None, path: Some(source_file.0), ..Default::default() }),
+            line,
+            column,
+            presentation_hint,
+            ..Default::default()
         }
     }
 }
 
+fn unknown_frame() -> StackFrame {
+    StackFrame {
+        id: 1,
+        name: "Unknown".to_string(),
+        line: 1,
+        column: 1,
+        presentation_hint: Some(StackFramePresentationhint::Subtle),
+        ..Default::default()
+    }
+}
+
 // TODO(#16)
 struct FunctionVariables {}