我在PopupWindow中有一个EditText，正确显示，当触摸SoftInput键盘打开时，如果在字段中写入拼写错误的单词，它将有红色下划线，如果触摸，则会发生以下异常
06-12 16:05:46.136: E/AndroidRuntime(10375): android.view.WindowManager$BadTokenException: Unable to add window -- token android.view.ViewRootImpl$W@41d51058 is not valid; is your activity running?
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.view.ViewRootImpl.setView(ViewRootImpl.java:769)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:278)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.PopupWindow.invokePopup(PopupWindow.java:1067)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.PopupWindow.showAtLocation(PopupWindow.java:891)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.PopupWindow.showAtLocation(PopupWindow.java:855)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.Editor$PinnedPopupWindow.updatePosition(Editor.java:2722)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.Editor$PinnedPopupWindow.show(Editor.java:2670)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.Editor$SuggestionsPopupWindow.show(Editor.java:2921)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.Editor.showSuggestions(Editor.java:2063)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.widget.Editor$1.run(Editor.java:1896)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.os.Handler.handleCallback(Handler.java:733)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.os.Handler.dispatchMessage(Handler.java:95)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.os.Looper.loop(Looper.java:136)
06-12 16:05:46.136: E/AndroidRuntime(10375): at android.app.ActivityThread.main(ActivityThread.java:5479)
06-12 16:05:46.136: E/AndroidRuntime(10375): at java.lang.reflect.Method.invokeNative(Native Method)
06-12 16:05:46.136: E/AndroidRuntime(10375): at java.lang.reflect.Method.invoke(Method.java:515)
06-12 16:05:46.136: E/AndroidRuntime(10375): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
06-12 16:05:46.136: E/AndroidRuntime(10375): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
06-12 16:05:46.136: E/AndroidRuntime(10375): at dalvik.system.NativeStart.main(Native Method)
我在StackOverflow上发现PopupWindow不能成为其他人的父母，但我无法控制键盘软件使用有效的上下文。
如何避免此错误？
PS：在Android 4.4.2+上发生，其中键盘具有自动拼写检查功能