Nullpointer exception when adding associations to classes with no name.

Stack trace:
Exception in thread "Animation Thread" java.lang.NullPointerException
    at ca.mcgill.sel.ram.controller.StructuralViewController.toLowerCaseFirst(StructuralViewController.java:246)
    at ca.mcgill.sel.ram.controller.StructuralViewController.createAssociation(StructuralViewController.java:183)
    at ca.mcgill.ram.ui.handler.impl.StructuralViewHandler.handleDoubleTapOnClass(StructuralViewHandler.java:230)
    at ca.mcgill.ram.ui.handler.impl.ClassifierViewHandler.processTapEvent(ClassifierViewHandler.java:142)
    at ca.mcgill.ram.ui.handler.BaseHandler.processGestureEvent(BaseHandler.java:50)
    at ca.mcgill.ram.ui.components.ContainerComponent.processGestureEvent(ContainerComponent.java:160)
    at org.mt4j.input.GestureEventSupport.fire(GestureEventSupport.java:184)
    at org.mt4j.input.GestureEventSupport.fireGestureEvt(GestureEventSupport.java:169)
    at org.mt4j.components.MTComponent.processGestureEvent(MTComponent.java:3033)
    at org.mt4j.input.inputProcessors.componentProcessors.AbstractComponentProcessor.fireGestureEvent(AbstractComponentProcessor.java:236)
    at org.mt4j.input.inputProcessors.componentProcessors.AbstractCursorProcessor.fireGestureEvent(AbstractCursorProcessor.java:169)
    at org.mt4j.input.inputProcessors.componentProcessors.tapProcessor.TapProcessor.endGesture(TapProcessor.java:208)
    at org.mt4j.input.inputProcessors.componentProcessors.tapProcessor.TapProcessor.cursorEnded(TapProcessor.java:172)
    at org.mt4j.input.inputProcessors.componentProcessors.AbstractCursorProcessor.processInputEvtImpl(AbstractCursorProcessor.java:143)
    at org.mt4j.input.inputProcessors.componentProcessors.AbstractComponentProcessor.processInputEvent(AbstractComponentProcessor.java:87)
    at org.mt4j.input.ComponentInputProcessorSupport.processInputEvent(ComponentInputProcessorSupport.java:76)
    at org.mt4j.components.MTComponent.dispatchInputEvent(MTComponent.java:2853)
    at org.mt4j.components.MTComponent.processInputEvent(MTComponent.java:2983)
    at org.mt4j.components.MTCanvas.processInputEvent(MTCanvas.java:449)
    at org.mt4j.input.inputProcessors.globalProcessors.AbstractGlobalInputProcessor.fireInputEvent(AbstractGlobalInputProcessor.java:138)
    at org.mt4j.input.inputProcessors.globalProcessors.InputRetargeter.processInputEvtImpl(InputRetargeter.java:91)
    at org.mt4j.input.inputProcessors.globalProcessors.AbstractGlobalInputProcessor.processInputEvent(AbstractGlobalInputProcessor.java:67)
    at org.mt4j.input.inputSources.AbstractInputSource.fireInputEvent(AbstractInputSource.java:208)
    at org.mt4j.input.inputSources.AbstractInputSource.flushEvents(AbstractInputSource.java:183)
    at org.mt4j.input.inputSources.AbstractInputSource.pre(AbstractInputSource.java:126)
    at org.mt4j.input.inputSources.AbstractInputSource.processAction(AbstractInputSource.java:86)
    at org.mt4j.AbstractMTApplication.runApplication(AbstractMTApplication.java:327)
    at org.mt4j.AbstractMTApplication.draw(AbstractMTApplication.java:272)
    at processing.core.PApplet.handleDraw(PApplet.java:1603)
    at processing.core.PApplet.run(PApplet.java:1502)
    at java.lang.Thread.run(Unknown Source)
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