Resolves: #6173 (review)

Author: leagris

src/main/java/blusunrize/immersiveengineering/common/gui/FluidSorterMenu.java

@@ -26,6 +26,7 @@
 import net.neoforged.fml.LogicalSide;
 import net.neoforged.neoforge.common.util.LogicalSidedProvider;
 import net.neoforged.neoforge.fluids.FluidStack;
+import net.neoforged.neoforge.server.ServerLifecycleHooks;
 
 import javax.annotation.Nonnull;
 import java.util.Arrays;
@@ -89,11 +90,10 @@ public void receiveMessageFromScreen(CompoundTag message)
 		{
 			int side = message.getInt("filter_side");
 			int slot = message.getInt("filter_slot");
-			FluidStack newFilter = FluidStack.parseOptional(
-					((MinecraftServer)LogicalSidedProvider.WORKQUEUE.get(LogicalSide.SERVER)).overworld()
-							.registryAccess(),
-					message.getCompound("filter")
-			);
+			var currentServer = ServerLifecycleHooks.getCurrentServer();
+			if(null == currentServer) return;
+			var registryAccess = currentServer.overworld().registryAccess();
+			FluidStack newFilter = FluidStack.parseOptional(registryAccess, message.getCompound("filter"));
 			if(!newFilter.isEmpty())
 				newFilter.setAmount(1); // Not strictly necessary, but also doesn't hurt
 			this.filters.get(side).get(slot).set(newFilter);