From e9f23f76aefe5dd2d2e7ac0fa37909a97d8b6f07 Mon Sep 17 00:00:00 2001
From: Roman Hotsiy <gotsijroman@gmail.com>
Date: Mon, 29 Jan 2018 10:51:45 +0200
Subject: [PATCH] fix: crash on 2-level md heading at the beginning

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

diff --git a/src/services/MarkdownRenderer.ts b/src/services/MarkdownRenderer.ts
index 4b51381f..491ed374 100644
--- a/src/services/MarkdownRenderer.ts
+++ b/src/services/MarkdownRenderer.ts
@@ -98,7 +98,10 @@ export class MarkdownRenderer {
           `<a class="share-link" href="#${id}"></a>`
         );
       } else if (tokens[idx].hLevel === 2) {
-        const { id } = this.saveHeading(content, this.currentTopHeading.items);
+        const { id } = this.saveHeading(
+          content,
+          this.currentTopHeading && this.currentTopHeading.items,
+        );
         return (
           `<a name="${id}"></a>` +
           `<h${tokens[idx].hLevel} ${SECTION_ATTR}="${id}" id="${id}">` +