First noticed in 148, still there in 155.

[code]
void setup() {
size(256, 256, P2D);
}

void draw() {
beginShape();
endShape();
}
[/code]

Or:

[code]
beginShape();
vertex(1, 1);
vertex(1, 1);
endShape();
[/code]

Yields:

[code]
Exception in thread "Animation Thread" java.lang.NullPointerException
at processing.core.PGraphics2D.resetMatrix(PGraphics2D.java:1849)
at processing.core.PGraphics2D.beginDraw(PGraphics2D.java:116)
at processing.core.PApplet.handleDraw(PApplet.java:1365)
at processing.core.PApplet.run(PApplet.java:1300)
at java.lang.Thread.run(Unknown Source)
[/code]

edit]
Example code to demonstrate the bug.

P2D does not exist yet. it will arrive soon, before the release of 1.0, but
it does not currently exist. see the reference for the size() command.

I started to realize this after trying to do other things.

I think I was just confused because it "partially" exists. Enough for it to
be the fastest thing that lets me flip pixels on a PImage and then draw the
PImage to the screen without distortion. P3D is fast too, but doesn't draw
the image pixel-for-pixel.

right, i just need to disable it more explicitly until i've finished...