# Getting NULL trying to fetch category from tournament object

**Error Description**

Customers are encountering a "Null Reference Exception" (as follows) when attempting to fetch categories from a tournament object that is successfully cached within the SDK.

```
Object reference not set to an instance of an object
```

**Applies to**

* UOF SDK .Net (v1.56.0) and
* UOF SDK .NetCore (v1.29.0) or older

**Symptoms**

When a user requests a tournament associated with a category and/or sport that hasn't been obtained and cached under the "All Sports" or "All Tournaments for All Sports" endpoints, category data will not be returned.

**Resolution**

Fix was published in versions UOF SDK .Net (v1.57.0) and UOF SDK .NetCore (v1.30.0). The user needs to upgrade to the aforementioned or later versions of the SDK.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.sportradar.com/uof/error-handling/error-catalogue/getting-null-trying-to-fetch-category-from-tournament-object.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.