崩溃: NullPointerException

Hi, I encountered a null pointer exception when using this library. Here is the failing stacktrace: 11-21 15:02:19.170 12985 12985 E AndroidRuntime: java.lang.NullPointerException: Attempt to get length of null array 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at com.roughike.bottombar.BottomBar.resizeTabsToCorrectSizes(BottomBar.java:391) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at com.roughike.bottombar.BottomBar.onLayout(BottomBar.java:761) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.View.layout(View.java:17572) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewGroup.layout(ViewGroup.java:5656) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1080) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.View.layout(View.java:17572) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewGroup.layout(ViewGroup.java:5656) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.FrameLayout.onLayout(FrameLayout.java:261) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.View.layout(View.java:17572) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewGroup.layout(ViewGroup.java:5656) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.View.layout(View.java:17572) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewGroup.layout(ViewGroup.java:5656) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.widget.FrameLayout.onLayout(FrameLayout.java:261) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at com.android.internal.policy.DecorView.onLayout(DecorView.java:755) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.View.layout(View.java:17572) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewGroup.layout(ViewGroup.java:5656) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2429) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2149) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1306) 11-21 15:02:19.170 12985 12985 E AndroidRuntime: at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6579) 11-21