diff --git a/common/buildcraft/transport/Gate.java b/common/buildcraft/transport/Gate.java
index 1655c60b..b7f6084a 100644
--- a/common/buildcraft/transport/Gate.java
+++ b/common/buildcraft/transport/Gate.java
@@ -325,7 +325,10 @@ public final class Gate implements IGate, ISidedStatementContainer, IRedstoneSta
 	public void openGui(EntityPlayer player) {
 		if (!player.worldObj.isRemote) {
 			player.openGui(BuildCraftTransport.instance, GuiIds.GATES, pipe.container.getWorldObj(), pipe.container.xCoord, pipe.container.yCoord, pipe.container.zCoord);
-			((ContainerGateInterface) player.openContainer).setGate(direction.ordinal());
+			// ThermalExpansion Autonomous Activator crash fix
+			if (player.openContainer instanceof ContainerGateInterface) {
+				((ContainerGateInterface) player.openContainer).setGate(direction.ordinal());
+			}
 		}
 	}