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

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java.lang.NullPointerException:
at com.nextgis.maplibui.activity.AttributesActivity.onSaveInstanceState(AttributesActivity.java:194)
at android.app.Activity.performSaveInstanceState(Activity.java:1137)
at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1215)
at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:2955)
at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3014)
at android.app.ActivityThread.access$900(ActivityThread.java:134)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1221)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4744)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)

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