diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/core/guide/SlimefunGuideUnlockMode.java b/src/main/java/io/github/thebusybiscuit/slimefun4/core/guide/SlimefunGuideUnlockMode.java
index 0a21f3d986..a42cfd88df 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/core/guide/SlimefunGuideUnlockMode.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/core/guide/SlimefunGuideUnlockMode.java
@@ -44,8 +44,7 @@ public enum SlimefunGuideUnlockMode {
      * @param s text to validate
      * @return {@link SlimefunGuideUnlockMode}
      */
-    @Nonnull
-    public static SlimefunGuideUnlockMode check(String s) {
+    public static @Nonnull SlimefunGuideUnlockMode check(@Nullable String s) {
         if (s == null) {
             return SlimefunGuideUnlockMode.EXPERIENCE;
         }