diff --git a/src/main/java/de/mari_023/ae2wtlib/AE2WTLibCreativeTab.java b/src/main/java/de/mari_023/ae2wtlib/AE2WTLibCreativeTab.java
index f658f66d..1f0aa268 100644
--- a/src/main/java/de/mari_023/ae2wtlib/AE2WTLibCreativeTab.java
+++ b/src/main/java/de/mari_023/ae2wtlib/AE2WTLibCreativeTab.java
@@ -1,7 +1,7 @@
 package de.mari_023.ae2wtlib;
 
-import java.util.ArrayDeque;
-import java.util.Collection;
+import java.util.ArrayList;
+import java.util.List;
 
 import net.minecraft.core.Registry;
 import net.minecraft.resources.ResourceLocation;
@@ -13,7 +13,7 @@
 import appeng.items.tools.powered.WirelessTerminalItem;
 
 public class AE2WTLibCreativeTab {
-    private static final Collection<ItemStack> items = new ArrayDeque<>();
+    private static final List<ItemStack> items = new ArrayList<>();
 
     public static void init(Registry<CreativeModeTab> registry) {
         var tab = CreativeModeTab.builder()
@@ -24,18 +24,18 @@ public static void init(Registry<CreativeModeTab> registry) {
         Registry.register(registry, new ResourceLocation(AE2wtlib.MOD_NAME, "main"), tab);
     }
 
-    public static void add(Item item) {
+    public static synchronized void add(Item item) {
         items.add(new ItemStack(item));
     }
 
-    public static void addTerminal(WirelessTerminalItem terminal) {
+    public static synchronized void addTerminal(WirelessTerminalItem terminal) {
         var stack = new ItemStack(terminal);
         items.add(stack.copy());
         terminal.injectAEPower(stack, terminal.getAEMaxPower(stack), Actionable.MODULATE);
         items.add(stack);
     }
 
-    private static void buildDisplayItems(CreativeModeTab.ItemDisplayParameters itemDisplayParameters,
+    private static synchronized void buildDisplayItems(CreativeModeTab.ItemDisplayParameters itemDisplayParameters,
             CreativeModeTab.Output output) {
         output.acceptAll(items);
     }