Cannot read property 'level' of undefined
Bug Report
Steps to reproduce
Run the following README.md:
# Heading 1 Test ## Heading 2 ### Heading 3A Lorem ipsum #### Heading 4A ##### Heading 5A Lorem ipsum ### Heading 3B Lorem ipsum #### Heading 4B <!-- {docsify-ignore} --> ##### Heading 5B Lorem ipsum
What is current behaviour
The sidebar does not show up and the console shows:
```docsify.min.js:1 Uncaught TypeError: Cannot read property 'level' of undefined
at $n.sidebar (docsify.min.js:1)
at Vn.Xn._renderSidebar (docsify.min.js:1)
at Vn.Pn (docsify.min.js:1)
at docsify.min.js:1
at o (docsify.min.js:1)
at B (docsify.min.js:1)
at t (docsify.min.js:1)
at docsify.min.js:1
at docsify.min.js:1
at docsify.min.js:1
What is the expected behaviour
Sidebar shows up
Other relevant information
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Bug does still occur when all/other plugins are disabled?
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Your OS: macOS Catalina
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Node.js version: 12.18.3
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npm/yarn version: 6.14.6
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Browser version: Chrome Version 84.0.4147.135 (Official Build) (64-bit)
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Docsify version: 4.11.6
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Docsify plugins: none
