From 00ab7f04fae5b55820b402c2b98b6c5046151242 Mon Sep 17 00:00:00 2001
From: Karl Seguin <k@openmymind.io>
Date: Mon, 16 Feb 2026 23:41:04 +0800
Subject: [PATCH] handle undefined symbol in debug log

---
 src/browser/js/Local.zig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/browser/js/Local.zig b/src/browser/js/Local.zig
index 78ec45b0..6ce1166e 100644
--- a/src/browser/js/Local.zig
+++ b/src/browser/js/Local.zig
@@ -1160,6 +1160,9 @@ fn _debugValue(self: *const Local, js_val: js.Value, seen: *std.AutoHashMapUnman
 
         if (js_val.isSymbol()) {
             const symbol_handle = v8.v8__Symbol__Description(@ptrCast(js_val.handle), self.isolate.handle).?;
+            if (v8.v8__Value__IsUndefined(symbol_handle)) {
+                return writer.writeAll("undefined (symbol)");
+            }
             return writer.print("{f} (symbol)", .{js.String{ .local = self, .handle = @ptrCast(symbol_handle) }});
         }
         const js_val_str = try js_val.toStringSlice();