Null Value exception if any row contain empty cell

I am getting an Exception when ever I run the my Backendless
application, because there is a column in my table which have only data
to specific rows. When i Put the dummy data in empty cells its working
fine, but when I put nothing in it I am getting the error.
Is there anyway to handle null values of table so I don’t have to play with dummy data.

Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference

The exception you showed suggests you invoke the toString() method on a variable which holds null.