diff --git a/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/dummy/DummyPermissibleBase.java b/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/dummy/DummyPermissibleBase.java
index 8f8524de..88cd1082 100644
--- a/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/dummy/DummyPermissibleBase.java
+++ b/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/dummy/DummyPermissibleBase.java
@@ -53,12 +53,12 @@ public class DummyPermissibleBase extends PermissibleBase {
 
     public static void nullFields(PermissibleBase permissibleBase) {
         try {
-            ATTACHMENTS_FIELD.set(permissibleBase, null);
+            ATTACHMENTS_FIELD.set(permissibleBase, Collections.emptyList());
         } catch (Exception e) {
             // ignore
         }
         try {
-            PERMISSIONS_FIELD.set(permissibleBase, null);
+            PERMISSIONS_FIELD.set(permissibleBase, Collections.emptyMap());
         } catch (Exception e) {
             // ignore
         }
diff --git a/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/permissible/LPPermissionAttachment.java b/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/permissible/LPPermissionAttachment.java
index 71a7c65c..9ecd7181 100644
--- a/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/permissible/LPPermissionAttachment.java
+++ b/bukkit/src/main/java/me/lucko/luckperms/bukkit/model/permissible/LPPermissionAttachment.java
@@ -110,7 +110,7 @@ public class LPPermissionAttachment extends PermissionAttachment {
     public LPPermissionAttachment(LPPermissible permissible, PermissionAttachment source) {
         super(DummyPlugin.INSTANCE, null);
         this.permissible = permissible;
-        this.owner = null;
+        this.owner = source.getPlugin();
 
         // copy
         this.perms.putAll(source.getPermissions());
@@ -389,19 +389,29 @@ public class LPPermissionAttachment extends PermissionAttachment {
         @Override
         public Set<String> keySet() {
             // just proxy
-            return LPPermissionAttachment.this.perms.keySet();
+            return Collections.unmodifiableSet(LPPermissionAttachment.this.perms.keySet());
         }
 
         @Override
         public Collection<Boolean> values() {
             // just proxy
-            return LPPermissionAttachment.this.perms.values();
+            return Collections.unmodifiableCollection(LPPermissionAttachment.this.perms.values());
         }
 
         @Override
         public Set<Entry<String, Boolean>> entrySet() {
             // just proxy
-            return LPPermissionAttachment.this.perms.entrySet();
+            return Collections.unmodifiableSet(LPPermissionAttachment.this.perms.entrySet());
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            return obj instanceof Map<?, ?> && LPPermissionAttachment.this.perms.equals(obj);
+        }
+
+        @Override
+        public int hashCode() {
+            return LPPermissionAttachment.this.perms.hashCode();
         }
     }
 }
diff --git a/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/dummy/DummyPermissibleBase.java b/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/dummy/DummyPermissibleBase.java
index 15af8c25..07a9caac 100644
--- a/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/dummy/DummyPermissibleBase.java
+++ b/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/dummy/DummyPermissibleBase.java
@@ -53,12 +53,12 @@ public class DummyPermissibleBase extends PermissibleBase {
 
     public static void nullFields(PermissibleBase permissibleBase) {
         try {
-            ATTACHMENTS_FIELD.set(permissibleBase, null);
+            ATTACHMENTS_FIELD.set(permissibleBase, Collections.emptyList());
         } catch (Exception e) {
             // ignore
         }
         try {
-            PERMISSIONS_FIELD.set(permissibleBase, null);
+            PERMISSIONS_FIELD.set(permissibleBase, Collections.emptyMap());
         } catch (Exception e) {
             // ignore
         }
diff --git a/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/permissible/LPPermissionAttachment.java b/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/permissible/LPPermissionAttachment.java
index 2182542d..09ac5366 100644
--- a/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/permissible/LPPermissionAttachment.java
+++ b/nukkit/src/main/java/me/lucko/luckperms/nukkit/model/permissible/LPPermissionAttachment.java
@@ -109,13 +109,13 @@ public class LPPermissionAttachment extends PermissionAttachment {
         injectFakeMap();
     }
 
-    public LPPermissionAttachment(LPPermissible permissible, PermissionAttachment nukkit) {
+    public LPPermissionAttachment(LPPermissible permissible, PermissionAttachment source) {
         super(DummyPlugin.INSTANCE, null);
         this.permissible = permissible;
-        this.owner = null;
+        this.owner = source.getPlugin();
 
         // copy
-        this.perms.putAll(nukkit.getPermissions());
+        this.perms.putAll(source.getPermissions());
         this.source = source;
 
         injectFakeMap();
@@ -419,19 +419,29 @@ public class LPPermissionAttachment extends PermissionAttachment {
         @Override
         public Set<String> keySet() {
             // just proxy
-            return LPPermissionAttachment.this.perms.keySet();
+            return Collections.unmodifiableSet(LPPermissionAttachment.this.perms.keySet());
         }
 
         @Override
         public Collection<Boolean> values() {
             // just proxy
-            return LPPermissionAttachment.this.perms.values();
+            return Collections.unmodifiableCollection(LPPermissionAttachment.this.perms.values());
         }
 
         @Override
         public Set<Entry<String, Boolean>> entrySet() {
             // just proxy
-            return LPPermissionAttachment.this.perms.entrySet();
+            return Collections.unmodifiableSet(LPPermissionAttachment.this.perms.entrySet());
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            return obj instanceof Map<?, ?> && LPPermissionAttachment.this.perms.equals(obj);
+        }
+
+        @Override
+        public int hashCode() {
+            return LPPermissionAttachment.this.perms.hashCode();
         }
     }
 }