Haven Errors

[BlitzKrieger]

So, recently whenever I login it'll play just fine for about 5 minutes. Then it will crash and tell me this error:

Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 1
at java.lang.String.substring(Unknown Source)
at haven.Text$Line.advance(Text.java:58)
at haven.TextEntry.draw(TextEntry.java:77)
at haven.Widget.draw(Widget.java:283)
at haven.Widget.draw(Widget.java:283)
at haven.SlenHud.draw(SlenHud.java:271)
at haven.Widget.draw(Widget.java:283)
at haven.RootWidget.draw(RootWidget.java:61)
at haven.UI.draw(UI.java:136)
at haven.HavenPanel.redraw(HavenPanel.java:254)
at haven.HavenPanel$1.display(HavenPanel.java:77)
at com.sun.opengl.impl.GLDrawableHelper.display(GLDrawableHelper.java:78)
at javax.media.opengl.GLCanvas$DisplayAction.run(GLCanvas.java:435)
at com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:194)
at javax.media.opengl.GLCanvas$DisplayOnEventDispatchThreadAction.run(GLCanvas.java:452)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)

I've updated my Java to see if it would do anything, and it didn't. What does this error mean and how can I fix it?

[BlitzKrieger]

In addition the error also seems to be caused when I type in game. This becomes frustrating when I am approached by people and whatnot.