Avoid NPE

src/com/massivecraft/massivecore/money/MoneyMixinVault.java

@@ -252,6 +252,7 @@ public class MoneyMixinVault extends MoneyMixinAbstract
 
 	public static Object getEconomyObject(String accountId)
 	{
+		if (null == accountId) return null;
 		// Because of Factions we have this crazy-workaround.
 		// Where offlineplayers will be used when possible
 		// but otherwise names will.

src/com/massivecraft/massivecore/store/SenderColl.java

@@ -70,7 +70,6 @@ public class SenderColl<E extends SenderEntity<E>> extends Coll<E> implements Se
 	@Override
 	public String fixId(Object oid)
 	{
-		// A null oid should always return null.
 		if (oid == null) throw new NullPointerException("oid");
 		
 		String ret = null;
@@ -87,8 +86,10 @@ public class SenderColl<E extends SenderEntity<E>> extends Coll<E> implements Se
 		if (ret == null)
 		{
 			// Always lower case.
-			return IdUtil.getId(oid);
+			ret = IdUtil.getId(oid);
 		}
+
+		if (ret == null) throw new NullPointerException("Could not fix: " + oid);
 		
 		if (this.isLowercasing())
 		{