From 20c3d1b109743e33ab60a75d69bf7ede73b15ce2 Mon Sep 17 00:00:00 2001
From: Richard Moore <github@ricmoo.com>
Date: Tue, 6 Jun 2023 21:24:02 -0400
Subject: [PATCH] Fixed type guard for non-Typed instances (#4087).

---
 src.ts/abi/typed.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src.ts/abi/typed.ts b/src.ts/abi/typed.ts
index ffbfe58a5..346b2d570 100644
--- a/src.ts/abi/typed.ts
+++ b/src.ts/abi/typed.ts
@@ -771,7 +771,10 @@ export class Typed {
      *  Returns true only if %%value%% is a [[Typed]] instance.
      */
     static isTyped(value: any): value is Typed {
-        return (value && value._typedSymbol === _typedSymbol);
+        return (value
+            && typeof(value) === "object"
+            && "_typedSymbol" in value
+            && value._typedSymbol === _typedSymbol);
     }
 
     /**