Looks like the background color of the terrain is null somehow.
Exception in thread "main" java.lang.NullPointerException
at ure.render.URendererOGL.addQuad(URendererOGL.java:470)
at ure.render.URendererOGL.addQuad(URendererOGL.java:420)
at ure.render.URendererOGL.drawRect(URendererOGL.java:311)
at ure.ui.modals.UModalMap.drawContent(UModalMap.java:27)
at ure.ui.modals.UModal.draw(UModal.java:130)
at ure.render.URendererOGL.render(URendererOGL.java:247)
at ure.render.URendererOGL.render(URendererOGL.java:249)
at ure.render.URendererOGL.render(URendererOGL.java:237)
at ure.sys.UCommander.gameLoop(UCommander.java:435)
at ure.examplegame.ExampleGame.startUp(ExampleGame.java:119)
at ure.ExampleMain.main(ExampleMain.java:9)```
Looks like the background color of the terrain is null somehow.