java - Couldn't read row 384, col 47 from CursorWindow. Make sure the Cursor is initialized correctly -

i'm reading data android calendar , got strange crash reports users like:

java.lang.illegalstateexception: couldn't read row 384, col 47 cursorwindow.  make sure cursor initialized correctly before accessing data it. 

my code here (bold line app crashes):

        cursor eventcursor = contentresolver.query             (builder.build(),              null,              calendarcontract.instances.calendar_id + " in (" + ids  + ")",              null,              null);          if (eventcursor == null)             return true;          while (eventcursor.movetonext()) {  //this line causecrash             ... something...         } 

why happens? can't simulated. never ever happened me , can't understand reason nor error message.

in beginning of iteration use eventcursor.movetofirst() move first row. may use this:

if (eventcursor != null) {      //start beginning     eventcursor.movetofirst();      // loop on rows     while (eventcursor.movetonext()) {          // somehing here     }  } 

you can check whether cursor has rows or not using eventcursor.getcount().