Submitted by: @hvlad

CREATE OR ALTER PROCEDURE SP_TEST
AS
DECLARE DUMMY INT;
BEGIN
FOR SELECT 1 FROM RDB$RELATION_FIELDS F ORDER BY F.RDB$FIELD_NAME
INTO :DUMMY
DO BEGIN
END
END

isql 1
EXECUTE PROCEDURE SP_TEST;

isql 2
EXECUTE PROCEDURE SP_TEST;

isql 1
EXIT;

isql 2
EXECUTE PROCEDURE SP_TEST;

Statement failed, SQLSTATE = 42000
At procedure 'SP_TEST'

Commits: 12cf2ed b5bbe96