zulrah: don't update when not logged in

runelite-client/src/main/java/net/runelite/client/plugins/zulrah/Zulrah.java

@@ -31,6 +31,7 @@ import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 import net.runelite.api.Client;
+import net.runelite.api.GameState;
 import net.runelite.api.NPC;
 import net.runelite.api.Perspective;
 import net.runelite.api.Point;
@@ -91,6 +92,11 @@ public class Zulrah extends Plugin
 
 	private synchronized void update()
 	{
+		if (client.getGameState() != GameState.LOGGED_IN)
+		{
+			return;
+		}
+
 		try
 		{
 			NPC zulrah = findZulrah();