java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.alpha.alphaproto.CustomKeyboardView.onDraw(CustomKeyboardView.java:48)
at android.view.View.draw(View.java:14465)
at android.view.View.getDisplayList(View.java:13362)
at android.view.View.getDisplayList(View.java:13404)
at android.view.View.draw(View.java:14182)
at android.view.ViewGroup.drawChild(ViewGroup.java:3103)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)
at android.view.View.getDisplayList(View.java:13357)
at android.view.View.getDisplayList(View.java:13404)
at android.view.View.draw(View.java:14182)
at android.view.ViewGroup.drawChild(ViewGroup.java:3103)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)
at android.view.View.draw(View.java:14468)
at android.widget.FrameLayout.draw(FrameLayout.java:472)
at android.view.View.getDisplayList(View.java:13362)
at android.view.View.getDisplayList(View.java:13404)
at android.view.View.draw(View.java:14182)
at android.view.ViewGroup.drawChild(ViewGroup.java:3103)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)
at android.view.View.getDisplayList(View.java:13357)
at android.view.View.getDisplayList(View.java:13404)
at android.view.View.draw(View.java:14182)
at android.view.ViewGroup.drawChild(ViewGroup.java:3103)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)
at android.view.View.draw(View.java:14468)
at android.widget.FrameLayout.draw(FrameLayout.java:472)
at android.view.View.getDisplayList(View.java:13362)
at android.view.View.getDisplayList(View.java:13404)
at android.view.HardwareRenderer$GlRenderer.buildDisplayList(HardwareRenderer.java:1570)
at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1449)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2377)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2249)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1879)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)

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