Spatial Index in MySQL - ERROR - Cannot get geometry object from data you send to the GEOMETRY field

Question

I am new to the whole \'spatial index\' thing, but it seems to be the best solution for filtering based on latitude/longitude. So I added a column to my table:

So I

Answer 1

OK I found the solution: Can't create a spatial index if some of the column fields contain no data. After running

  UPDATE `addresses` SET `point` = POINT( lng, lat )

Everything worked fine.