diff --git a/src/core/engines/noweb/session.noweb.core.ts b/src/core/engines/noweb/session.noweb.core.ts
index b85c6f6f..e1c8c78f 100644
--- a/src/core/engines/noweb/session.noweb.core.ts
+++ b/src/core/engines/noweb/session.noweb.core.ts
@@ -321,9 +321,9 @@ export class WhatsappSessionNoWebCore extends WhatsappSession {
     // Detect browser
     let browser = ['Ubuntu', 'Chrome', '22.04.4'] as WABrowserDescription;
     let deviceName =
-      this.sessionConfig.client?.deviceName ?? WAHA_CLIENT_DEVICE_NAME;
+      this.sessionConfig?.client?.deviceName ?? WAHA_CLIENT_DEVICE_NAME;
     let browserName =
-      this.sessionConfig.client?.browserName ?? WAHA_CLIENT_BROWSER_NAME;
+      this.sessionConfig?.client?.browserName ?? WAHA_CLIENT_BROWSER_NAME;
     if (browserName && !deviceName) {
       browser = Browsers.appropriate(browserName);
     } else if (!browserName && deviceName) {
diff --git a/src/core/engines/webjs/session.webjs.core.ts b/src/core/engines/webjs/session.webjs.core.ts
index 5387531d..66012387 100644
--- a/src/core/engines/webjs/session.webjs.core.ts
+++ b/src/core/engines/webjs/session.webjs.core.ts
@@ -247,9 +247,9 @@ export class WhatsappSessionWebJSCore extends WhatsappSession {
     args.unshift(`--a-waha-timestamp=${new Date()}`);
     args.unshift(`--a-waha-session=${this.name}`);
     const deviceName =
-      this.sessionConfig.client?.deviceName ?? WAHA_CLIENT_DEVICE_NAME;
+      this.sessionConfig?.client?.deviceName ?? WAHA_CLIENT_DEVICE_NAME;
     const browserName =
-      this.sessionConfig.client?.browserName ?? WAHA_CLIENT_BROWSER_NAME;
+      this.sessionConfig?.client?.browserName ?? WAHA_CLIENT_BROWSER_NAME;
     return {
       puppeteer: {
         protocolTimeout: 300_000,