diff --git a/src/main/java/pojlib/API.java b/src/main/java/pojlib/API.java
index 65271770..e4897192 100644
--- a/src/main/java/pojlib/API.java
+++ b/src/main/java/pojlib/API.java
@@ -199,7 +199,7 @@ public static boolean removeAccount(Activity activity, String uuid) {
      *
      * @param activity Android activity object
      */
-    public static void login(Activity activity, String accountUUID)
+    public static void login(Activity activity, @Nullable String accountUUID)
     {
         ConnectivityManager connManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkCapabilities capabilities = connManager.getNetworkCapabilities(connManager.getActiveNetwork());