diff --git a/src/main/java/net/frozenorb/apiv3/model/ServerGroup.java b/src/main/java/net/frozenorb/apiv3/model/ServerGroup.java
index d958594..0271a60 100644
--- a/src/main/java/net/frozenorb/apiv3/model/ServerGroup.java
+++ b/src/main/java/net/frozenorb/apiv3/model/ServerGroup.java
@@ -1,6 +1,7 @@
 package net.frozenorb.apiv3.model;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
 import com.mongodb.async.SingleResultCallback;
 import com.mongodb.async.client.MongoCollection;
 import fr.javatic.mongo.jacksonCodec.Entity;
@@ -73,7 +74,11 @@ public final class ServerGroup {
     }
 
     public Map<String, Boolean> calculatePermissions(Rank rank) {
-        return PermissionUtils.mergeUpTo(permissions, rank);
+        if (permissions == null) {
+            return ImmutableMap.of();
+        } else {
+            return PermissionUtils.mergeUpTo(permissions, rank);
+        }
     }
 
     public void insert(SingleResultCallback<Void> callback) {