Error in presave submission

Module loses entered values on presave.
Error log:
Notice: Undefined index: latitude в функции _gm3_field_get_points_string_from_array() (string 878 in /var/www/htm/modules/gm3/gm3_field/gm3_field.module).
Notice: Undefined index: longitude в функции _gm3_field_get_points_string_from_array() (string 878 in /var/www/htm/modules/gm3/gm3_field/gm3_field.module).