diff --git a/src/Structures/Collections/ArrayCollection.php b/src/Structures/Collections/ArrayCollection.php
index ed6e8de..c2ce55c 100644
--- a/src/Structures/Collections/ArrayCollection.php
+++ b/src/Structures/Collections/ArrayCollection.php
@@ -301,7 +301,7 @@ private function getProperty(mixed $target, string|int $keyName, bool $throwOnMi
      * @return static
      * @psalm-return static<TKey,T>
      */
-    public function filter(Closure $func = null): static
+    public function filter(?Closure $func = null): static
     {
         return $this->createFrom(array_filter($this->elements, $func, ARRAY_FILTER_USE_BOTH));
     }
diff --git a/src/Traits/HasPrePostActions.php b/src/Traits/HasPrePostActions.php
index 6241b7b..f2f6e7a 100644
--- a/src/Traits/HasPrePostActions.php
+++ b/src/Traits/HasPrePostActions.php
@@ -16,7 +16,7 @@ public function addCallbackAction(string $key, callable $action): self
         return $this;
     }
 
-    public function getCallbackActions(string $key = null): array
+    public function getCallbackActions(?string $key = null): array
     {
         return $key ?
             $this->executeCallbacks[$key] ?? []
diff --git a/src/Traits/UseStorage.php b/src/Traits/UseStorage.php
index 9f727bd..1e52881 100644
--- a/src/Traits/UseStorage.php
+++ b/src/Traits/UseStorage.php
@@ -17,7 +17,11 @@
  */
 trait UseStorage
 {
-    private Storage $storage;
+    private Storage $storage {
+        get {
+            return $this->storage ??= new Storage();
+        }
+    }
 
     protected function propertyExists(string $name): bool
     {