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drag and drop

I am using standard dhtmlxgrid.. when I do multiple field drag and grop, sometimes it works fine without throwing any error. but sometimes it throws _childIndexes is null or not an object..

I am curious to know why it works sometimes without error, and why it throws error.

 

Actually it must not work for multiple items at all, it may still work correctly if you drag a single row, but when multiple row dragged in standard edition of dhtmlxgrid - result is kind of unpredictable.
The mentioned error means that some operation against not existing row issued.