Steps to reproduce: (for master)

1. Import attached xml
2. Configure Action and Media type settings in order to get emails about new Problems.
3. Add macro to Media Type email Message template: LOG AGE: {ITEM.LOG.AGE1}.
4. In /tmp folder create file log.txt.
5. Run Zabbix server.
6. Add some new lines with "text" to /tmp/log.txt
7. Get Email about new Zabbix problem
8. Discover that {ITEM.LOG.AGE1} is resolved to inadequate value like: 18514d 13h 53m 19s