总是报这个空指针，手机上会crash

[weitianxiang19910000]

java.lang.NullPointerException: Attempt to invoke virtual method 'int com.kunfei.bookshelf.widget.page.TxtChapter.getPageSize()' on a null object reference
at com.kunfei.bookshelf.widget.page.PageLoader.pagingEnd(PageLoader.java:755)
at com.kunfei.bookshelf.widget.page.PageView.changePage(PageView.java:651)
at com.kunfei.bookshelf.widget.page.animation.HorizonPageAnim.abortAnim(HorizonPageAnim.java:164)
at com.kunfei.bookshelf.widget.page.animation.HorizonPageAnim.onTouchEvent(HorizonPageAnim.java:54)
at com.kunfei.bookshelf.widget.page.PageView.onTouchEvent(PageView.java:508)
at android.view.View.dispatchTouchEvent(View.java:11788)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2974)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2604)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2974)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2604)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2974)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2604)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2974)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2604)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2974)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2604)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2974)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2604)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:549)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1953)
at android.app.Activity.dispatchTouchEvent(Activity.java:3548)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:502)
at android.view.View.dispatchPointerEvent(View.java:12027)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5278)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5067)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4581)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4634)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4600)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4727)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4608)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4784)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4581)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4634)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4600)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4608)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4581)
at android.view.ViewRootImpl.deliverInpu