Fix ParticleInventory

src/de/steamwar/lobby/inventories/ParticleInventory.java

@@ -160,7 +160,10 @@ public class ParticleInventory {
             }
         }
 
-        SWListInv<SpecialParticle> particleSWListInv = new SWListInv<>(player, "§6Partikel", false, particleList, (clickType, particle) -> lobbyPlayer.setParticle(particle));
+        SWListInv<SpecialParticle> particleSWListInv = new SWListInv<>(player, "§6Partikel", false, particleList, (clickType, particle) -> {
+            if (particle == null) return;
+            lobbyPlayer.setParticle(particle);
+        });
         particleSWListInv.setItem(49, Material.BARRIER, "§8Keine Partikel", new ArrayList<>(), false, clickType -> {
             lobbyPlayer.setParticle(null);
         });