diff --git a/src/net/milkbowl/vault/permission/plugins/Permission_PermissionsBukkit.java b/src/net/milkbowl/vault/permission/plugins/Permission_PermissionsBukkit.java
index bb8acec..4e33879 100644
--- a/src/net/milkbowl/vault/permission/plugins/Permission_PermissionsBukkit.java
+++ b/src/net/milkbowl/vault/permission/plugins/Permission_PermissionsBukkit.java
@@ -234,6 +234,10 @@ public class Permission_PermissionsBukkit extends Permission {
     public String[] getGroups() {
         List<String> groupNames = new ArrayList<String>();
         for (Group group : perms.getAllGroups()) {
+            //Ignore groups with bad data.
+            if (group == null || group.getName() == null) {
+                continue;
+            }
             groupNames.add(group.getName());
         }