Nil return on subquery in IS

Could not fetch master tables sql: Scan error on column index 6: converting driver.Value type <nil> ("<nil>") to a uint64:

SELECT a.TABLE_SCHEMA as Table_schema ,  a.TABLE_NAME as Table_name ,a.ENGINE as Engine,a.TABLE_ROWS as Table_rows ,COALESCE(a.DATA_LENGTH,0) as Data_length,COALESCE(a.INDEX_LENGTH,0) as Index_length ,(select CONV(LEFT(MD5(group_concat(concat(b.column_name,b.column_type,COALESCE(b.is_nullable,''),COALESCE(b.CHARACTER_SET_NAME,''), COALESCE(b.COLLATION_NAME,''),COALESCE(b.COLUMN_DEFAULT,''),COALESCE(c.CONSTRAINT_NAME,''),COALESCE(c.ORDINAL_POSITION,'')))), 16), 16, 10)    FROM information_schema.COLUMNS b left join information_schema.KEY_COLUMN_USAGE c ON b.table_schema=c.table_schema  and  b.table_name=c.table_name where b.table_schema=a.table_schema  and  b.table_name=a.table_name ) as Table_crc FROM information_schema.TABLES a WHERE a.TABLE_TYPE='BASE TABLE' and a.TABLE_SCHEMA NOT IN('information_schema','mysql','performance_schema')

set sql_log_bin=0;  

CREATE DATABASE IF NOT EXISTS geonames;

USE geonames;

CREATE OR REPLACE TABLE `geo_name_new` ( 

`geonameid` int(10) unsigned NOT NULL default '0', 

`name` varchar(200) NOT NULL default '', 

`ansiname` varchar(200) NOT NULL default '', 

`alternatenames` varchar(2000) NOT NULL default '', 

`latitude` double NOT NULL default '0', 

`longitude` double NOT NULL default '0', 

`feature_class` char(1) , 

`feature_code` varchar(10) , 

`country_code` char(2), 

`cc2` varchar(60), 

`admin1_code` varchar(20) default '', 

`admin2_code` varchar(80) default '', 

`admin3_code` varchar(20) default '', 

`admin4_code` varchar(20) default '', 

`population` bigint(11) default '0', 

`elevation` int(11) default '0', 

`gtopo30` int(11) default '0', 

`timezone` varchar(40), 

`modification_date` date default '0000-00-00', 

PRIMARY KEY (`geonameid`) 

) CHARACTER SET utf8 ; 

set global local_infile=1; 

load data local infile 'allCountries.txt' INTO TABLE geo_name_new; 

alter table geo_name_new add column gis_point POINT NOT NULL DEFAULT  (POINT(latitude,longitude)), add spatial index geo(gis_point) ;

drop table if exists geo_name_old;

RENAME TABLE geo_filter to geo_name_old , geo_name_new to geo_name;