This bug was originally marked as duplicate of bug 221857, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.

Build: NetBeans IDE Dev (Build 201212310001)
VM: Java HotSpot(TM) Client VM, 23.6-b04, Java(TM) SE Runtime Environment, 1.7.0_10-b18
OS: Windows 7

User Comments:
GUEST: I was removing the template comment lines from a newly created php file.

Stanisov: I just push a "point" button on keyboard in my new PHP file

GUEST: IndexOutOfBoundsException: start=-99 < 0
The error is above.

GUEST: I had just created a new file, selected and deleted the default php content and begun typing. The screen shows a single '<' character.

Eugene_Moshyn: php include

daskasfo: copy paste

GUEST: Try create new file

GUEST: I created new PHP file and started typing :
<?php
print
?>

marqusG: I'm creating a new CodeIgniter controller in a new just created project following this tutorial: http://morshed-iiuc.blogspot.it/2011/11/how-can-i-use-codeigniter-with-netbeans.html
The new file has been created in the IDE but simple deleting first four line (To change this template...) raised the error and now it is raised any two/three seconds moving cursor.

daskasfo: correct code

GUEST: I deleted the phpFile template content

<?php
.  }
.  }    deleted these
.  }

GUEST: Just typed text

GUEST: I created new file.

GUEST: Typing cls [tab] to create the autocomplete class for a php file.

GUEST: when i want to write class, i get this problem. Thanks
<?php

class

GUEST: Try create new file

joseph_ds: Deleted a comment block in PHP.

GUEST: copy code from website to netbeans 7.3 beta2

GUEST: Editting a PHP file, just deleted the default text for a new php file, started to type my own.

GUEST: Cut code snippet from one file in to another file (both tabs open)

GUEST: I selected and deleted everything from the document. It was the default PHP template code.
This appeared right after pressing the backspace button.

GUEST: Deleting a part of a new PHP page.

GUEST: edit code in file PHP

drazisil: Pasting Smarty code

GUEST: just backspacing...

GUEST: I added a new PHP class file

GUEST: Just typed text

GUEST: parse

GUEST: create new php file

GUEST: deleting php file template

GUEST: Open a new file

GUEST: I am using ctrl+space on php file.




Stacktrace: 
java.lang.IndexOutOfBoundsException: start=-93 < 0
   at org.netbeans.lib.editor.util.CharSequenceUtilities.checkIndexesValid(CharSequenceUtilities.java:529)
   at org.netbeans.modules.editor.lib2.document.CharContent.subSequence(CharContent.java:95)
   at org.netbeans.lib.lexer.token.DefaultToken.text(DefaultToken.java:142)
   at org.netbeans.editor.CustomFoldManager.scanToken(CustomFoldManager.java:485)
   at org.netbeans.editor.CustomFoldManager.getMarkList(CustomFoldManager.java:287)
   at org.netbeans.editor.CustomFoldManager.processTokenList(CustomFoldManager.java:305)