"E315: ml_get: invalid lnum: 87" error in vim

Question

When I try to change the tab with gt this error occurred :

"E315: ml_get: invalid lnum: 87"

You can see it in following picture:

If further information need, comment it.

Answer 1

An unfamiliar error in Vim! What do you do?

Here's what:

1. Look it up.

   :h E315
   

2. Read what it says.

   This is an internal Vim error. Please try to find out how it can be reproduced, and submit a bug report |bugreport.vim|.

3. Understand what it says.

   It is a bug in Vim.

4. Act.

   Investigate the error conditions and file a bug on the vim_dev mailing list.