diff --git a/wire/core/Session.php b/wire/core/Session.php
index e3c02ffd..07cc42df 100644
--- a/wire/core/Session.php
+++ b/wire/core/Session.php
@@ -119,6 +119,14 @@ class Session extends Wire implements \IteratorAggregate {
 	 */
 	protected $sessionAllow = null;
 
+	/**
+	 * Instance of custom session handler module, when in use (null when not)
+	 * 
+	 * @var WireSessionHandler|null
+	 * 
+	 */
+	protected $sessionHandler = null;
+
 	/**
 	 * Name of key/index within $_SESSION where PW keeps its session data
 	 * 
@@ -1486,5 +1494,22 @@ class Session extends Wire implements \IteratorAggregate {
 		if(is_null($this->CSRF)) $this->CSRF = $this->wire(new SessionCSRF());
 		return $this->CSRF; 
 	}
+	
+	/**
+	 * Get or set current session handler instance (WireSessionHandler)
+	 *
+	 * #pw-internal
+	 *
+	 * @param WireSessionHandler|null $sessionHandler Specify only when setting, omit to get session handler. 
+	 * @return null|WireSessionHandler Returns WireSessionHandler instance, or…
+	 *   returns null when session handler is not yet known or is PHP (file system)
+	 * @since 3.0.166
+	 *
+	 */
+	public function sessionHandler(WireSessionHandler $sessionHandler = null) {
+		if($sessionHandler) $this->sessionHandler = $sessionHandler;
+		return $this->sessionHandler;
+	}
+
 
 }
diff --git a/wire/core/WireSessionHandler.php b/wire/core/WireSessionHandler.php
index 3aa53241..a4a933b1 100644
--- a/wire/core/WireSessionHandler.php
+++ b/wire/core/WireSessionHandler.php
@@ -20,7 +20,7 @@ abstract class WireSessionHandler extends WireData implements Module {
 	 */
 	public function wired() {
 		if(!$this->sessionExists()) {
-			$this->addHookBefore('Session::init', $this, 'attach');
+			$this->addHookBefore('Session::init', $this, 'hookSessionInit');
 			register_shutdown_function('session_write_close');
 		}
 	}
@@ -31,6 +31,18 @@ abstract class WireSessionHandler extends WireData implements Module {
 	 */
 	public function init() { }
 
+	/**
+	 * Hook before Session::init
+	 * 
+	 * @param HookEvent $event
+	 * 
+	 */
+	public function hookSessionInit(HookEvent $event) {
+		$session = $event->object; /** @var Session $session */
+		$this->attach();
+		$session->sessionHandler($this);
+	}
+
 	/**
 	 * Attach this as the session handler
 	 *