diff --git a/browser/lib/markdown.js b/browser/lib/markdown.js
index 2dc98121..49183442 100644
--- a/browser/lib/markdown.js
+++ b/browser/lib/markdown.js
@@ -289,7 +289,9 @@ class Markdown {
           case 'list_item_open':
           case 'paragraph_open':
           case 'table_open':
-            token.attrPush(['data-line', token.map[0]])
+            if (token.map) {
+              token.attrPush(['data-line', token.map[0]])
+            }
         }
       })
       const result = originalRender.call(this.md.renderer, tokens, options, env)
diff --git a/tests/fixtures/markdowns.js b/tests/fixtures/markdowns.js
index 0ee80909..340f2ddd 100644
--- a/tests/fixtures/markdowns.js
+++ b/tests/fixtures/markdowns.js
@@ -104,6 +104,11 @@ Term 2 with *inline markup*
 `
 const shortcuts = '<kbd>Ctrl</kbd>\n\n[[Ctrl]]'
 
+const footnote = `
+^[hello-world]
+hello-world: https://github.com/BoostIO/Boostnote/
+`
+
 export default {
   basic,
   codeblock,
@@ -115,5 +120,6 @@ export default {
   subTexts,
   supTexts,
   deflists,
-  shortcuts
+  shortcuts,
+  footnote
 }
diff --git a/tests/lib/markdown-test.js b/tests/lib/markdown-test.js
index 46ae5941..31ffc518 100644
--- a/tests/lib/markdown-test.js
+++ b/tests/lib/markdown-test.js
@@ -68,3 +68,8 @@ test('Markdown.render() should render shortcuts correctly', t => {
   const rendered = md.render(markdownFixtures.shortcuts)
   t.snapshot(rendered)
 })
+
+test('Markdown.render() should render footnote correctly', t => {
+  const rendered = md.render(markdownFixtures.footnote)
+  t.snapshot(rendered)
+})
diff --git a/tests/lib/snapshots/markdown-test.js.md b/tests/lib/snapshots/markdown-test.js.md
index 56c4466f..4111c2f2 100644
--- a/tests/lib/snapshots/markdown-test.js.md
+++ b/tests/lib/snapshots/markdown-test.js.md
@@ -4,6 +4,21 @@ The actual snapshot is saved in `markdown-test.js.snap`.
 
 Generated by [AVA](https://ava.li).
 
+## Markdown.render() should render footnote correctly
+
+> Snapshot 1
+
+    `<p data-line="1"><sup class="footnote-ref"><a href="#fn1" id="fnref1">[1]</a></sup><br />␊
+    hello-world: <a href="https://github.com/BoostIO/Boostnote/">https://github.com/BoostIO/Boostnote/</a></p>␊
+    <hr class="footnotes-sep" />␊
+    <section class="footnotes">␊
+    <ol class="footnotes-list">␊
+    <li id="fn1" class="footnote-item"><p>hello-world <a href="#fnref1" class="footnote-backref">↩︎</a></p>␊
+    </li>␊
+    </ol>␊
+    </section>␊
+    `
+
 ## Markdown.render() should render line breaks correctly
 
 > Snapshot 1
diff --git a/tests/lib/snapshots/markdown-test.js.snap b/tests/lib/snapshots/markdown-test.js.snap
index 67d43616..3f5ec41c 100644
Binary files a/tests/lib/snapshots/markdown-test.js.snap and b/tests/lib/snapshots/markdown-test.js.snap differ