Can not upload an Update of one of our extensions

Summary

Uploading a new version of our glossary2 Extensions results in a Oops an error ocurred

Steps to reproduce

Upload an extension, add description and activate GPL checkbox and click an upload.

Example URL

https://extensions.typo3.org/my-extensions/extension-upload/?tx_terfe2_pi1%5Baction%5D=createVersion&tx_terfe2_pi1%5Bcontroller%5D=Extension&cHash=88f10563447e95e5ea4f7cc65f7eda38

What is the current bug behavior?

Uploading results in following error:

Oops, an error occurred!

What is the expected correct behavior?

Upload the extension without any errors.

Relevant logs and/or screenshots

No screenshot needed. There is no backtrace and it's the default error message of TYPO3 ExceptionHandler