Sometimes when I'm editing HTML, PHP or ASP I either hit CTRL+HOME or PGUP a few times and the edit window cuts off the top part of the page. It's still there, but I can't move the scrollbar up any further and I can't see the text. If I close the file and then reopen it everything's fine until it randomly happens again. I can't find anything that causes this to happen, it appears to be just random for me :/

java.lang.NullPointerException
at org.gjt.sp.jedit.textarea.TextArea.scrollTo(TextArea.java:862)
at org.gjt.sp.jedit.textarea.TextArea.scrollToCaret(TextArea.java:714)
at org.gjt.sp.jedit.textarea.TextArea._finishCaretUpdate(TextArea.java:5051)
at org.gjt.sp.jedit.textarea.TextArea.finishCaretUpdate(TextArea.java:5203)
at org.gjt.sp.jedit.textarea.TextArea.moveCaretPosition(TextArea.java:2214)
at org.gjt.sp.jedit.textarea.TextArea.moveCaretPosition(TextArea.java:2180)
at org.gjt.sp.jedit.textarea.TextArea.moveCaretPosition(TextArea.java:2169)
at org.gjt.sp.jedit.textarea.TextArea.goToBufferStart(TextArea.java:3150)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at bsh.Reflect.invokeMethod(Reflect.java:134)
at bsh.Reflect.invokeObjectMethod(Reflect.java:80)
at bsh.Name.invokeMethod(Name.java:858)
at bsh.BSHMethodInvocation.eval(BSHMethodInvocation.java:75)
at bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:102)
at bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:47)
at bsh.BSHBlock.evalBlock(BSHBlock.java:130)
at bsh.BSHBlock.eval(BSHBlock.java:80)
at bsh.BshMethod.invokeImpl(BshMethod.java:362)
at bsh.BshMethod.invoke(BshMethod.java:258)
at bsh.BshMethod.invoke(BshMethod.java:186)
at org.gjt.sp.jedit.BeanShell.runCachedBlock(BeanShell.java:509)
at org.gjt.sp.jedit.BeanShellAction.invoke(BeanShellAction.java:76)
at org.gjt.sp.jedit.gui.InputHandler.invokeAction(InputHandler.java:440)
at org.gjt.sp.jedit.gui.InputHandler.invokeAction(InputHandler.java:406)
at org.gjt.sp.jedit.gui.DefaultInputHandler.handleKey(DefaultInputHandler.java:373)
at org.gjt.sp.jedit.gui.InputHandler.processKeyEventKeyStrokeHandling(InputHandler.java:295)
at org.gjt.sp.jedit.gui.InputHandler.processKeyEvent(InputHandler.java:184)
at org.gjt.sp.jedit.textarea.TextArea.processKeyEvent(TextArea.java:4557)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)