From d78e35052aa136348cc1d91ec45d00ec347730a5 Mon Sep 17 00:00:00 2001
From: Hsieh Chin Fan <pham@topo.tw>
Date: Tue, 15 Oct 2024 19:59:20 +0800
Subject: fix: in case anchor element has no property href

---
 src/dumbymap.mjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dumbymap.mjs b/src/dumbymap.mjs
index 4d1a2ed..fb89d61 100644
--- a/src/dumbymap.mjs
+++ b/src/dumbymap.mjs
@@ -165,7 +165,7 @@ export const generateMaps = (container, {
   /** LINK: Add external symbol on anchors */
   container.querySelectorAll('a')
     .forEach(a => {
-      if (a.href.startsWith('http') && !a.href.startsWith(window.location.origin)) {
+      if (typeof a.href === 'string' && a.href.startsWith('http') && !a.href.startsWith(window.location.origin)) {
         a.classList.add('external')
       }
     })
-- 
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