# Unexpected type mapstr.M warning
**URL:** https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834
**Category:** Beats
**Tags:** filebeat
**Created:** [December 8, 2022, 9:41pm UTC](https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834 "2022-12-08T21:41:27Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Alex\_Lavrov](https://discuss.elastic.co/u/Alex_Lavrov)
#### Post date: [December 8, 2022, 9:41pm UTC](https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834/1 "2022-12-08T21:41:27Z")
Hello,
I'm sending JSON logs using filebeat and suddenly I started to get this error:
{"log.level":"warn","@timestamp":"2022-12-08T23:33:51.575+0200","log.logger":"conditions","log.origin":{"file.name":"conditions/matcher.go","file.line":96},"message":"unexpected type mapstr.M in contains condition as it accepts only strings.","service.name":"filebeat","ecs.version":"1.6.0"}
Can't understand what exactly causing it. I checked all log entries, all of them are valid JSON's ...
Thank you in advance.
---
### Author:  [@Venkata\_Raja](https://discuss.elastic.co/u/Venkata_Raja)
#### Post date: [December 9, 2022, 10:35am UTC](https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834/2 "2022-12-09T10:35:39Z")
Hi Alex,
Welcome to Community!
It seems your contains condition is throwing an error as it is expecting strings only. Check your filebeat processors configuration?
More details here: [Define processors | Filebeat Reference [8.5] | Elastic](https://www.elastic.co/guide/en/beats/filebeat/current/defining-processors.html#condition-contains)
---
### Author:  [@Alex\_Lavrov](https://discuss.elastic.co/u/Alex_Lavrov)
#### Post date: [December 9, 2022, 11:28am UTC](https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834/3 "2022-12-09T11:28:20Z")
Hello,
Thank you for the welcome 😉
The only processors section that I have is the default one:
```auto
processors:
- add_host_metadata:
when.not.contains.tags: forwarded
- add_cloud_metadata: ~
- add_docker_metadata: ~
- add_kubernetes_metadata: ~
```
---
### Author:  [@Venkata\_Raja](https://discuss.elastic.co/u/Venkata_Raja)
#### Post date: [December 9, 2022, 1:05pm UTC](https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834/4 "2022-12-09T13:05:11Z")
If you are not using that contains condition , you can remove it
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 6, 2023, 3:05pm UTC](https://discuss.elastic.co/t/unexpected-type-mapstr-m-warning/320834/5 "2023-01-06T15:05:50Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.