Index: branches/5.2.x/core/kernel/session/inp_session.php
===================================================================
--- branches/5.2.x/core/kernel/session/inp_session.php
+++ branches/5.2.x/core/kernel/session/inp_session.php
@@ -80,6 +80,7 @@
 		$this->Storage->DeleteEditTables();
 		$this->Data = new Params();
 		$this->SID = $this->CachedSID = '';
+		$this->SessionSet = false;
 
 		if ($this->CookiesEnabled) {
 			$this->SetSessionCookie(); //will remove the cookie due to value (sid) is empty