Tekkit 3.1.1 Server - Cannot access the End

[Sasune]

Title: Tekkit 3.1.1 Server - Cannot access the End

Version: 3.0.3/3.0.4

OS: Windows 7

Java Version: jre7

Description of Problem:

Some of the member of my tekkit server decided to try to "beat" the game but they said that the end is bugged and it's just all black and you start to die and once you die itsasy you fell off the world. Any way to fix this?

Error Messages:

N/A

Error Log:

N/A