# Weird Error while running the program
**URL:** https://discourse.processing.org/t/weird-error-while-running-the-program/40730
**Category:** Processing
**Created:** [January 27, 2023, 2:20pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730 "2023-01-27T14:20:42Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Aryszin](https://discourse.processing.org/u/Aryszin)
#### Post date: [January 27, 2023, 2:20pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730/1 "2023-01-27T14:20:43Z")
I got this error:
> NullPointerException
> java.lang.NullPointerException: Cannot invoke “java.lang.Integer.intValue()” because the return value of “java.util.Map.remove(Object)” is null
> at processing.core.PApplet.dequeueWindowEvents(PApplet.java:9855)
> at processing.core.PApplet.handleDraw(PApplet.java:2122)
> at processing.opengl.PSurfaceJOGL$DrawListener.display(PSurfaceJOGL.java:821)
> at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:692)
> at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:674)
> at jogamp.opengl.GLAutoDrawableBase$2.run(GLAutoDrawableBase.java:443)
> at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1293)
> at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1147)
> at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:782)
> at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:81)
> at com.jogamp.opengl.util.AnimatorBase.display(AnimatorBase.java:453)
> at com.jogamp.opengl.util.FPSAnimator$MainTask.run(FPSAnimator.java:178)
> at java.base/java.util.TimerThread.mainLoop(Timer.java:566)
> at java.base/java.util.TimerThread.run(Timer.java:516)
> NullPointerException
while running the sktech normaly
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [January 27, 2023, 3:21pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730/2 "2023-01-27T15:21:47Z")
> [@Aryszin](#):
>
> “java.util.Map.remove(…
please show the code for this
---
### Author:  [@Aryszin](https://discourse.processing.org/u/Aryszin)
#### Post date: [January 29, 2023, 1:13pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730/3 "2023-01-29T13:13:44Z")
its 7 tabs with 6 classes & 1 main script. it has over 2000 lines of code!
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [January 29, 2023, 3:27pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730/4 "2023-01-29T15:27:54Z")
I meant just the lines surrounding the line with
```
java.util.Map.remove(…
```
in it
---
### Author:  [@Aryszin](https://discourse.processing.org/u/Aryszin)
#### Post date: [February 2, 2023, 6:43pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730/5 "2023-02-02T18:43:03Z")
im sorry i dont know what you mean i dont have anything in my code that says “remove(”
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [February 2, 2023, 9:56pm UTC](https://discourse.processing.org/t/weird-error-while-running-the-program/40730/6 "2023-02-02T21:56:36Z")
> [@Aryszin](#):
>
> NullPointerException
> java.lang.NullPointerException: Cannot invoke “java.lang.Integer.intValue()” because the return value of “java.util.Map.remove(Object)” is null
> at processing.core.PApplet.dequeueWindowEvents(PApplet.java:9855)
> at processing.core.PApplet.handleDraw(PApplet.java:2122)
Without knowing the exact version of Processing you are using we can’t use the line numbers to find the actual source code that is generating the NPE so a little bit of guess work is needed.
`java.lang.Integer.intValue()` converts an _Integer object_ into a _primitive int variable_ so if we try this sketch we get the same NPE
```auto
Integer io;
void setup() {
println(io.intValue());
}
```
but the next part is challenging
`because the return value of “java.util.Map.remove(Object)” is null`
you say you are not calling the remove method but are you using HashMaps and if so what methods in this class are you using.