This bug was originally marked as duplicate of bug 267234, 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 201608200002)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27
OS: Windows 10

User Comments:
archmonster: Popping up randomly while editing php files, since applying the last update (yesterday).

GUEST: ?

GUEST: ?

GUEST: Just opened project with sudo access

GUEST: ?

GUEST: Editing

GUEST: Selected a bit of code.

GUEST: Just changed the php version from /usr/bin/php to /opt/local/bin/php70

GUEST: You can say in the report that you fixed this in build 201607270002, this very clearly proves otherwise. How can I go back to a dev build without this nasty shit?

GUEST: Go to a define declaration (ctrl+left mouse button)

GUEST: unknown.

nleck: nav

GUEST: just pops up....

GUEST: <Please provide a description of the problem or the steps to reproduce>

GUEST: ?

GUEST: ?

GUEST: just by doing nothing

GUEST: Ctrl * S.

GUEST: moved my mouse

GUEST: IDK what happened

zeloras: autocomplete

GUEST: saved

GUEST: I updated and now this stupid bug report shows up every couple minutes

GUEST: just clicked into the code

GUEST: vb

GUEST: Please see this issue

GUEST: Just opened a php file and scrolled trough it. When stopping scrolling this error popped up

GUEST: and again

GUEST: closed a file

GUEST: ?

GUEST: whats happen

GUEST: ?

GUEST: unknown.

GUEST: moved a chrome window

GUEST: I FUCKING DID NOTHING!!!

tmysik: CTRL + click in a PHP file (trying to navigate to parent/overriden method)

knives214: Please provide a description of the problem or the steps to reproduce

m1k0: click on enywere in ide

GUEST: ...

GUEST: Please see this issue

GUEST: interesting

GUEST: I edit PHP.

GUEST: By scrollen in editor

GUEST: ??Symfony3.0???????netbeans???

GUEST: .

GUEST: I work on project symfony

GUEST: <Please provide a description of the problem or the steps to reproduce>

GUEST: working on a php file (and don't fucking dare to mark it duplicate. If you don't want duplicates don't fucking ask me to submit this every time)

GUEST: ?

GUEST: I put the right margin to 0

GUEST: writting php code

GUEST: ?

GUEST: ?

GUEST: ?

GUEST: moved my mousea bit

GUEST: how fucking many more times do I have to report this before someone will not only claim it is fixed but also fix it???

GUEST: just by opening the view

GUEST: how can I turn this off?

GUEST: clicked in a document

GUEST: ?

mkhramov: Edit java code

zeloras: I dont know

GUEST: Still trying to work on the same file. And please ask the dickhead who marked this as complete to undo that. This issue very clearly hasn't been resolved in 201607270002

GUEST: reading code

GUEST: alt tabbed into netbeans

GUEST: unknown.

GUEST: selected a line

GUEST: removing content using ctrl+z

GUEST: ?

GUEST: unknown.

GUEST: ?

geoB: Attempting to run a focused test method in a Symfony project.

GUEST: I have better stuff to do than report this error over and over

GUEST: ?

GUEST: ?

GUEST: scroll.

GUEST: unknown.

GUEST: ??svn??????????

GUEST: Something error

GUEST: working on an existing php file

GUEST: ?

nleck: checkin

GUEST: working on php code

GUEST: ?

GUEST: ?

vee: Open Netbeans. It's already opened project. 
Open files.
Edit some file.
Save.
Do nothing.
Switch to other window and switch back.
Click on somewhere in the editor.
Error!

GUEST: ?

GUEST: saved using ctrl+s

GUEST: i don't know why netbeans always alert this window, my system os win7, use netbeans dev version, and use symfony develop my web application

Alniks: opened .flt file

GUEST: ?

GUEST: scrolled

GUEST: moving the mouse

GUEST: ?

GUEST: ?

GUEST: is using arrow keys not allowed anymore?

GUEST: ?

GUEST: ?

GUEST: unknown.

GUEST: mouse scroll.

GUEST: nothing special

GUEST: ?

GUEST: Opened a file through project tree and clicked on editor.

GUEST: ?

vercinstex: movie mouse on code

GUEST: ?

GUEST: ?

GUEST: ?

GUEST: opend an additional project

GUEST: ???????????

GUEST: ?

GUEST: FIX THIS CRAP NOW!!!

GUEST: ?

GUEST: Cause Uknown

GUEST: again nothing special, please STOP naging me with these reports!!!

muellermi: Move mous pointer to an at sign @
Seems to be ralated to bug 267235

GUEST: mouse scroll.

GUEST: down entry key.

GUEST: ...

GUEST: ?

GUEST: tief godverdomme op met deze popups!!!!!!!!!!

GUEST: ?

GUEST: I was typing code (php)

GUEST: ?

GUEST: By select in editor

GUEST: ?

GUEST: just working on a php file

GUEST: AGAIN???

GUEST: scroll.

GUEST: ?

GUEST: ?

GUEST: ..

GUEST: AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

GUEST: Podczas normalnej pracy pojawia si? b??d zwiazany z nie wiadomo czym

GUEST: ?

GUEST: ?

zmirc: Just switched to NetBeans from a different program, after computer was asleep.

GUEST: ?

paolosca: Switched from a PHP file to another

GUEST: ?

GUEST: still just working

GUEST: ?

GUEST: nothing

GUEST: Just happened while scrolling through a PHP document.

GUEST: ?

GUEST: unknown.

GUEST: It's happened offen when i editing PHP files.
I don't know reason.

GUEST: unknown.

GUEST: ?

GUEST: ?

GUEST: just by doing nothing

GUEST: ?

GUEST: Please provide a description of the problem or the steps to reproduce

GUEST: ?

GUEST: -

GUEST: <Please provide a description of the problem or the steps to reproduce>Enter

GUEST: ?

GUEST: All time, when I write, make scroll etc

GUEST: scrolling trough a file and reading code

paolosca: Editing a PHP file

GUEST: ?

GUEST: split window I guess

GUEST: unknown.

GUEST: Edit php script.

GUEST: unknown?

GUEST: Please fuck off with these nasty popups. I only use this build because you dicks don't give support for php7 in the production version (which is of course not how it should be). I DO NOT WANT THIS SHIT WITH IT!!!!

GUEST: ?

GUEST: replace value

GUEST: FUCK OFF!!!

GUEST: just was setting composer for php

GUEST: It jumps this message when file opened and changing git branch

m1k0: Please provide a description of the problem or the steps to reproduce

GUEST: whats happen

muellermi: paused editing

vercinstex: awaiting code completion

thalles.rosa: such error arise when I use Ctrl + C or Ctrl + V or Ctrl + X.

GUEST: ?

GUEST: ?

fonsecas72: nothing

GUEST: scrolled trough my code

GUEST: just came back from lunch




Stacktrace: 
java.lang.NullPointerException
   at org.netbeans.modules.editor.NbToolTip.buildTip(NbToolTip.java:244)
   at org.netbeans.modules.editor.NbToolTip.buildToolTip(NbToolTip.java:117)
   at org.netbeans.modules.editor.NbEditorKit$NbBuildToolTipAction.actionPerformed(NbEditorKit.java:984)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:339)
   at org.netbeans.spi.editor.AbstractEditorAction.actionPerformed(AbstractEditorAction.java:462)
   at org.netbeans.editor.ext.ToolTipSupport.updateToolTip(ToolTipSupport.java:571)