diff --git a/src/OpenSSL.php b/src/OpenSSL.php
index afa7a0b..f8fb8d7 100644
--- a/src/OpenSSL.php
+++ b/src/OpenSSL.php
@@ -57,7 +57,8 @@ class OpenSSL
         $ffi = static::getFFI();
         $errs = [];
         while (0 !== ($code = $ffi->ERR_get_error())) {
-            $errs[] = FFI::string($ffi->ERR_error_string($code, null));
+            $ptr = $ffi->ERR_error_string($code, null);
+            $errs[] = FFI::string($ptr);
         }
 
         return $errs;
@@ -68,7 +69,7 @@ class OpenSSL
         return FFI::cast("long long", $data)->cdata;
     }
 
-    static $caStore = null;
+    public static $caStore = null;
 
     public static function CAStore()
     {
diff --git a/src/OpenSSL/C/CBackedObjectWithOwner.php b/src/OpenSSL/C/CBackedObjectWithOwner.php
index c016d66..9773e37 100644
--- a/src/OpenSSL/C/CBackedObjectWithOwner.php
+++ b/src/OpenSSL/C/CBackedObjectWithOwner.php
@@ -10,7 +10,7 @@ use FFI\CData;
 
 class CBackedObjectWithOwner extends CBackedObject
 {
-    static private array $known = [];
+    private static array $known = [];
     private int $address = -1;
 
     protected FFI $ffi;
diff --git a/src/OpenSSL/PKCS7/Signed.php b/src/OpenSSL/PKCS7/Signed.php
index 6fe4c6c..b770be1 100644
--- a/src/OpenSSL/PKCS7/Signed.php
+++ b/src/OpenSSL/PKCS7/Signed.php
@@ -15,7 +15,6 @@ class Signed
 
     public function getCerts(): X509Stack
     {
-
         $stack = X509Stack::from($this->ffi, $this->data->cert, $this);
         $stack->unmanaged();
         return $stack;
diff --git a/src/OpenSSL/Stack.php b/src/OpenSSL/Stack.php
index 104a020..26749b5 100644
--- a/src/OpenSSL/Stack.php
+++ b/src/OpenSSL/Stack.php
@@ -196,9 +196,9 @@ abstract class Stack extends CBackedObjectWithOwner implements Countable, ArrayA
 
     public function __clone()
     {
-        $cObj = $this->ffi->sk_dup($this->cObj);
+        $this->cObj = $this->ffi->sk_dup($this->cObj);
 
-        if ($cObj === null) {
+        if ($this->cObj === null) {
             throw new RuntimeException("Failed to clone stack");
         }
 
@@ -206,7 +206,5 @@ abstract class Stack extends CBackedObjectWithOwner implements Countable, ArrayA
         foreach ($this as $obj) {
             $obj->pushRefCount();
         }
-
-        return new static($this->ffi, $cObj);
     }
 }