Cannot access a disposed object.

We get this error everytime when our PRTG Monitor Software wants to check ProGet startpage but bevor we updatet it to 4.0.14 it works great. PLS tell me what the message means.

 Logged: 5/20/2016 2:37:25 PM
 Level: Error
 Category: HTTP
 Message: An error occurred in the web application: Cannot access a disposed object. Object name: 'SlimMemoryStream'.

 Details:
URL: https://nuget.proget-dev.net/
Referrer: (not set)
User: SA-PRTG
User Agent: Mozilla/5.0 (compatible; PRTG Network Monitor (www.paessler.com); Windows)
Stack trace:    at Inedo.Web.PageFree.SimplePageBase.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Product: ProGet
Version: 4.0.14

Looks like a bug caused by accessing certain pages from clients that don't support gzip compression. We'll have this fixed in 4.0.15, which should be released today.