When using the Enterprise Edition, the event subscriber of ezsystems/ezplatform-page-builder (file src/lib/Event/Subscriber/InjectCrossOriginHelperSubscriber.php) is triggered on the responses.

In the injectSnippet function of this file, there is a call on the ->getResponse() method of the HTTP Request, which, in case of a BinaryStreamResponse from ezsystems/ezpublish-kernel (https://github.com/ezsystems/ezpublish-kernel/blob/master/eZ/Bundle/EzPublishIOBundle/BinaryStreamResponse.php#L227) will always return null and break the next instruction (strripos native php function that cannot work with a null argument).

This problem mainly breaks all front content/download links ans also some use cases while using the DFS.

Problem reported here and here on slack and investigated with Kevin Dejour from eZ.