分析一下友盟错误日志

app已经上线，友盟的统计分析-错误分析列表有这样的crush日志，出现在适配器的这一行
holder.save_data.setText(history.getBrowsetime());
希望有大牛指点，不胜感激！一下是详细日志：

java.lang.IllegalArgumentException: Bad class: class java.lang.String
 at java.text.NumberFormat.format(NumberFormat.java:304)
 at java.text.DecimalFormat.format(DecimalFormat.java:702)
 at java.text.Format.format(Format.java:93)
 at com.xinhuan.adapter.HistoryAdapter.getView(HistoryAdapter.java:102)
 at android.widget.AbsListView.obtainView(AbsListView.java:2271)
 at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
 at android.widget.ListView.onMeasure(ListView.java:1175)
 at android.view.View.measure(View.java:16525)
 at android.widget.RelativeLayout.measureChild(RelativeLayout.java:689)
 at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:473)
 at android.view.View.measure(View.java:16525)
 at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)
 at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)
 at android.view.View.measure(View.java:16525)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
 at android.view.View.measure(View.java:16525)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
 at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
 at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
 at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
 at android.view.View.measure(View.java:16525)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
 at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
 at android.view.View.measure(View.java:16525)
 at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1946)
 at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1143)
 at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1325)
 at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1030)
 at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5639)
 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:5111)
 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:806)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
 at dalvik.system.NativeStart.main(Native Method)