diff --git a/bukkit/paper-loader/build.gradle.kts b/bukkit/paper-loader/build.gradle.kts
index 09e83e3e6..a0f22f351 100644
--- a/bukkit/paper-loader/build.gradle.kts
+++ b/bukkit/paper-loader/build.gradle.kts
@@ -116,6 +116,7 @@ paper {
         register("PxRpg") { required = false }
         register("Ratziel") { required = false }
         register("Reforges") { required = false }
+        register("Sertraline") { required = false }
         register("Slimefun") { required = false }
         register("StatTrackers") { required = false }
         register("SX-Item") { required = false }
diff --git a/core/src/main/java/net/momirealms/craftengine/core/plugin/context/ContextHolder.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/context/ContextHolder.java
index cda3fd723..fa2c721f7 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/plugin/context/ContextHolder.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/context/ContextHolder.java
@@ -65,7 +65,7 @@ public class ContextHolder {
     }
 
     @SuppressWarnings("unchecked")
-    public <T> T getOrNull(ContextKey<T> parameter) {
+    public <T> @Nullable T getOrNull(ContextKey<T> parameter) {
         Supplier<Object> supplier = this.params.get(parameter);
         if (supplier == null) {
             return null;