Canceling upload of big file leads to "Internal Server error"

[NickCloudAT]

Steps to reproduce

1. Start an upload of a big file (i tested with 80 MB)
2. Cancel the upload at any given time

Expected behaviour

Upload should get canceled with "Upload canceled" message (or whatever in english)

Actual behaviour

Progress bar wont disappear instantly but will still gain progress for a few seconds till an "Internal server error" appears

Server configuration

Operating system: Ubuntu 16.04

Web server: Apache2

Database: MySQL

**PHP version:**7.0

Nextcloud version: (see Nextcloud admin page) 14.0.0

Updated from an older Nextcloud/ownCloud or fresh install: Fresh

Where did you install Nextcloud from: Official nextcloud page

Signing status:

Signing status

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.
```No errors have been found.
</details>

**List of activated apps:**
<details>
<summary>App list</summary>

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

</details>

**Nextcloud configuration:**
<details>
<summary>Config report</summary>

```https://pastebin.com/QQ2m5SKZ
</details>

**Are you using external storage, if yes which one:** Enabled yes, using no

**Are you using encryption:** no

**Are you using an external user-backend, if yes which one:** no

### Client configuration
**Browser:** Opera/Edge/Chrome tested

**Operating system:** Win10

### Logs

#### Nextcloud log (data/nextcloud.log)
<details>
<summary>Nextcloud log</summary>

Insert your Nextcloud log here

https://pleasureuhc.eu/nextcloud/index.php/s/ntQzaKE5XrBbT2n
</details>

[nextcloud-bot]

GitMate.io thinks possibly related issues are #4875 (Internal Server Error when accessing shared file), #10140 (Internal server error), #6994 (Internal Server Error), #3296 (Error Message if uploading files), and #8954 (Uploading large files fails).

[skjnldsv]

As I cannot reproduce the original issue anymore, I will close this ticket. If this is still happening please make sure to upgrade to the latest version. After that, feel free to reopen.