ODBC Driver Error - prepared statement broken after execution error

2) Do some calls to get for sample "duplicate primary key error"

3) After this every call o this statement return error.

4) Other statements can be executed w/o problems

db_insert(1,1); //ok
db_insert(1,2); //error
db_insert(2,3); //error
db_select(2,&value); //ok

Error log:

Retcode [-1] when executing SQLExecute(stmt_insert)
Error [-1] in SQLExecute(stmt_insert)ERROR:
[unixODBC]ERROR: duplicate key value violates unique constraint "bench_pk"
Key (id)=(1) already exists.;
Error while executing the query
ODBC Error/Warning = 23505, Additional Error/Warning = 7

Retcode [-1] when executing SQLExecute(stmt_insert)

Error [-1] in SQLExecute(stmt_insert)ERROR:
[unixODBC]Error while executing the query
ODBC Error/Warning = S1000, Additional Error/Warning = 7

test source - https://github.com/vvromanov/db_test

--
Vladimir Romanov