diff --git a/bukkit/src/main/java/net/william278/husksync/data/BukkitData.java b/bukkit/src/main/java/net/william278/husksync/data/BukkitData.java
index 93af6963..7670bf49 100644
--- a/bukkit/src/main/java/net/william278/husksync/data/BukkitData.java
+++ b/bukkit/src/main/java/net/william278/husksync/data/BukkitData.java
@@ -45,6 +45,7 @@ import org.bukkit.inventory.EquipmentSlotGroup;
 //#endif
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.persistence.PersistentDataContainer;
+import org.bukkit.plugin.Plugin;
 import org.bukkit.potion.PotionEffect;
 import org.bukkit.potion.PotionEffectType;
 import org.jetbrains.annotations.NotNull;
@@ -567,6 +568,14 @@ public abstract class BukkitData implements Data {
 
         @NotNull
         public static BukkitData.Attributes adapt(@NotNull Player player, @NotNull HuskSync plugin) {
+            if (!Bukkit.isPrimaryThread()) {
+                try {
+                    return Bukkit.getScheduler().callSyncMethod((Plugin) plugin, () -> adapt(player, plugin)).get();
+                } catch (Exception e) {
+                    throw new IllegalStateException("Failed to adapt attributes on main thread", e);
+                }
+            }
+
             final List<Attribute> attributes = Lists.newArrayList();
             final AttributeSettings settings = plugin.getSettings().getSynchronization().getAttributes();
             Registry.ATTRIBUTE.forEach(id -> {
@@ -665,6 +674,15 @@ public abstract class BukkitData implements Data {
 
         @Override
         public void apply(@NotNull BukkitUser user, @NotNull BukkitHuskSync plugin) throws IllegalStateException {
+            if (!Bukkit.isPrimaryThread()) {
+                try {
+                    Bukkit.getScheduler().callSyncMethod(plugin, () -> { this.apply(user, plugin); return null; }).get();
+                    return;
+                } catch (Exception e) {
+                    throw new IllegalStateException("Failed to apply attributes on main thread", e);
+                }
+            }
+
             final AttributeSettings settings = plugin.getSettings().getSynchronization().getAttributes();
             Registry.ATTRIBUTE.forEach(id -> {
                 if (settings.isIgnoredAttribute(id.getKey().toString())) {