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This exception has no message.
java.lang.NullPointerException at pl.edu.pw.browser.Browser.openLocalFile(Browser.java:136) at pl.edu.pw.browser.component.FileChooser.approveSelection(FileChooser.java:31) at javax.swing.plaf.basic.BasicFileChooserUI$DoubleClickListener.mouseClicked(BasicFileChooserUI.java:412) at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:208) at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:207) at java.awt.Component.processMouseEvent(Component.java:5137) at java.awt.Component.processEvent(Component.java:4931) at java.awt.Container.processEvent(Container.java:1566) at java.awt.Component.dispatchEventImpl(Component.java:3639) at java.awt.Container.dispatchEventImpl(Container.java:1623) at java.awt.Component.dispatchEvent(Component.java:3480) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3174) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095) at java.awt.Container.dispatchEventImpl(Container.java:1609) at java.awt.Window.dispatchEventImpl(Window.java:1590) at java.awt.Component.dispatchEvent(Component.java:3480) at java.awt.EventQueue.dispatchEvent(EventQueue.java:450) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136) at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)