# Bug OP-7793 - Filter on CF string brakes form in split screen.

Project: OpenProject
Status: closed
URL: https://community.openproject.org/work_packages/OP-7793

## Open points

_No work packages_

## Details

| Attribute | Value |
| --- | --- |
| Date |  |
| Priority | High |
| Module |  |
| Target versions | 11.0.1 |
| Observed in versions | 11.0.0 |
| Sprint | 11.0.1 |
| Backlog bucket |  |
| Bug found in version (deprecated) | 11.0.x |
| Found in mobile app version |  |
| Follow-up feedback e-mail |  |
| Requires doc change | No |
| Accessibility | No |
| Pull preview |  |
| List |  |
| Labels |  |

## People

| Attribute | Value |
| --- | --- |
| Assignee |  |
| Accountable |  |
| Product manager |  |
| Developers |  |
| Designer |  |
| Ordered by |  |
| Signed off by |  |
| Interest by |  |

## Planning

| Attribute | Value |
| --- | --- |
| Relevance |  |

## Costs

| Attribute | Value |
| --- | --- |
| Votes |  |
| Work |  |
| Labor costs |  |

## Description

Reported by TMM (Madeleine). Reproducable on other instances:

Given:

*   CF of type string
*   Type with this CF
*   Project with this CF

Reproduce:

*   Go to work package list
*   Add filter on the CF **with operator "is" and a value.** Any string will do. I used "michi".
*   Click on _Create_ and select the type that also uses the CF.
*   The right side, where the form should load keeps white.
    *   Apparently the API request for the form returns a "500"

```json
{"_type":"Error","errorIdentifier":"urn:openproject-org:api:v3:errors:InternalServerError","message":"An internal error has occured. undefined method `merge' for \"michi\":String"}
```

Sentry error: https://sentry.openproject.com/sentry/saas-openproject-prod/issues/636