Code review

ISSUE: CR-SET-45

Author: dokmanovicsofija

src/Util/RivertyDeviceFingerprintParamsProvider.php

@@ -91,7 +91,13 @@ public function getSessionId(): string
      */
     public function getExistingSessionId(): ?string
     {
-        $sessionId = $this->getSession()?->get(self::SESSION_ID_SESSION_KEY);
+        $session = $this->getSession();
+
+        if (is_null($session)) {
+            return null;
+        }
+
+        $sessionId = $session->get(self::SESSION_ID_SESSION_KEY);
 
         return empty($sessionId) ? null : (string)$sessionId;
     }
@@ -103,7 +109,11 @@ public function getExistingSessionId(): ?string
      */
     public function clear(): void
     {
-        $this->getSession()?->remove(self::SESSION_ID_SESSION_KEY);
+        $session = $this->getSession();
+
+        if (!is_null($session)) {
+            $session->remove(self::SESSION_ID_SESSION_KEY);
+        }
     }
 
     /**