Check if holograms are disabled.

.gitlab-ci.yml

@@ -4,7 +4,7 @@ stages:
 variables:
   name: "EpicFurnaces"
   path: "/builds/$CI_PROJECT_PATH"
-  version: "4.3.1"
+  version: "4.3.2"
 
 build:
   stage: build

src/main/java/com/songoda/epicfurnaces/tasks/HologramTask.java

@@ -33,6 +33,8 @@ public class HologramTask extends BukkitRunnable {
 
     @Override
     public void run() {
+        if (plugin.getHologram() == null) return;
+
         for (Furnace furnace : plugin.getFurnaceManager().getFurnaces().values()) {
             plugin.getHologram().update(furnace);
         }