# Post text does not render (firstBlock.shift is not a function)
**URL:** https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345
**Category:** Bug
**Tags:** markdown-it-review
**Created:** [March 17, 2017, 10:32am UTC](https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345 "2017-03-17T10:32:45Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@masda70](https://meta.discourse.org/u/masda70)
#### Post date: [March 17, 2017, 10:32am UTC](https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345/1 "2017-03-17T10:32:45Z")
The following post text causes the error `Uncaught TypeError: firstBlock.shift is not a function`
```plaintext
- a b
-
c
```
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [March 17, 2017, 1:16pm UTC](https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345/2 "2017-03-17T13:16:40Z")
confirmed bug… adding #markdown-it-review on to this, @eviltrout your call if you want take this any earlier
---
### Author:  [@eviltrout](https://meta.discourse.org/u/eviltrout)
#### Post date: [March 17, 2017, 2:35pm UTC](https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345/3 "2017-03-17T14:35:10Z")
I’ll probably skip it for now – markdown-it is much nicer and this is invalid HTML anyway.
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [June 26, 2017, 2:05pm UTC](https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345/4 "2017-06-26T14:05:12Z")
Fixed per:
> [@CommonMark testing started here!](https://meta.discourse.org/t/commonmark-testing-started-here/65121):
>
> Per our [migration plans](https://meta.discourse.org/t/discourse-commonmark-migration-plans-confetti-ball-balloon), I just enabled [markdown.it](https://github.com/markdown-it/markdown-it) at Meta. It is an excellent [CommonMark](http://commonmark.org/) compliant engine. I expect quite a few edges to be found during this period of testing. Do not open bugs about the new Engine, just reply here. I/we will be updating the top post here with the list of issues and striking out stuff as it is fixed. Current known issues (to be fixed)white_check_mark Onebox vanishes after you start typing and works not-super consistently white_check_mark pending…
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [June 26, 2017, 2:05pm UTC](https://meta.discourse.org/t/post-text-does-not-render-firstblock-shift-is-not-a-function/59345/5 "2017-06-26T14:05:15Z")