Steps to reproduce:

1. Installed Unix ODBC: unixODBC-2.3.7-1.el8.x86_64, unixODBC-devel-2.3.7-1.el8.x86_64
2. Installed Oracle client packages: oracle-instantclient11.2-odbc-11.2.0.4.0-1.x86_64, oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64, oracle-instantclient11.2-sqlplus-11.2.0.4.0-1.x86_64, oracle-instantclient11.2-jdbc-11.2.0.4.0-1.x86_64, oracle-instantclient11.2-tools-11.2.0.4.0-1.x86_64
3. Configured datasource and driver in /etc/odbc.ini 

   [$DATASOURCE]
   Driver=/usr/lib/oracle/11.2/client64/lib/libsqora.so.11.1
   DSN=$DBNAME
   ServerName=$HOST
   UserID=$USER
   Password=$PASS

1. Configured oracle ODBC driver in /etc/odbcinst.ini 

   [Oracle 11g ODBC driver]
   Description     = Oracle ODBC driver for Oracle 11g
   Driver          = /usr/lib/oracle/11.2/client64/lib/libsqora.so.11.1 

1. Configured connection string in /usr/lib/oracle/11.2/client64/network/admin/tnsnames.ora

   $HOST =
     (DESCRIPTION =
       (ADDRESS = (PROTOCOL = TCP)(HOST = $host_ip)(Port = 1521))
       (CONNECT_DATA =
         (SID =$DBNAME)
       )
     )
   

1. Configured environment for zabbix server in /etc/sysconfig/zabbix_server

   PATH=/sbin:/usr/sbin:/bin:/usr/bin ORACLE_HOME=/usr/lib/oracle/11.2/client64 PATH=$PATH:$ORACLE_HOME/bin LD_LIBRARY_PATH=$ORACLE_HOME/lib:/usr/lib64:/usr/lib:$ORACLE_HOME/bin TNS_ADMIN=$ORACLE_HOME/network/admin

1. Restarted zabbix-server
2. Tested connection to the database with isql tool as zabbix server user. It works fine.
3. Created an Item of type "Database monitor" in zabbix server host with key: "db.odbc.select[Blocked sessions count,\{$DSN}]" and Sql query: "select count(distinct sid) from v$session_blockers;"
4. Pressed Get value in the item test form

Result

Zabbix server crashed

See log file attached.

Expected:
The Item query should return the number of blocked sessions in a database. 

P.S. Initially I received the error on zabbix server 5.0.2, then I updated the server to 5.0.3. Zabbix keeps crashing during odbc check.