Submitted by: @sim1984

Is duplicated by CORE5309
Is related to CORE5277

databases.conf contains

test = d:\fb\fb30\data\test.fdb
{
DefaultDbCachePages = 8K
}

In isql execute

set names utf8;

set sql dialect 3;

create database '127.0.0.1/3051:test'
user 'SYSDBA' password 'masterkey'
page_size 8192
default character set utf8;

create table t(
name char(10)
);

insert into t(name) values(null);

commit;

-----------------------

gbak -b -g -V -user SYSDBA -pas masterkey -se 127.0.0.1/3051:service_mgr test d:\fb\fb30\data\test.dmp

work wothout error

rename test.fdb

----------------------
gbak -c -V -user SYSDBA -pas masterkey -st TD -se 127.0.0.1/3
051:service_mgr d:\fb\fb30\data\test.dmp test
gbak: time delta
gbak: 0.000 0.000 opened file d:\fb\fb30\data\test.dmp
gbak: 0.001 0.001 transportable backup -- data in XDR format
gbak: 0.001 0.000 backup file is compressed
gbak: 0.001 0.000 backup version is 10
gbak: 0.232 0.231 created database test, page_size 8192 bytes
gbak: 0.237 0.004 started transaction
gbak: ERROR:arithmetic exception, numeric overflow, or string truncation
gbak: ERROR: string right truncation
gbak: ERROR: expected length 10, actual 40
gbak: ERROR: gds_$send failed
gbak: ERROR: Exiting before completion due to errors
gbak:Exiting before completion due to errors

If field name has type varchar(10) error not reproduced.

Commits: 600b408 0e90030 891c172 36e4fa9 0d46c91 8f02eb0