diff --git a/plugins/woocommerce/changelog/52410-fix-52326-jwt-error-when-no-session b/plugins/woocommerce/changelog/52410-fix-52326-jwt-error-when-no-session
new file mode 100644
index 00000000000..621a79272fa
--- /dev/null
+++ b/plugins/woocommerce/changelog/52410-fix-52326-jwt-error-when-no-session
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Make sure session exists before calling its functions in the Cart StoreApi route
\ No newline at end of file
diff --git a/plugins/woocommerce/src/StoreApi/Routes/V1/AbstractCartRoute.php b/plugins/woocommerce/src/StoreApi/Routes/V1/AbstractCartRoute.php
index e26cb056934..68557bbca2a 100644
--- a/plugins/woocommerce/src/StoreApi/Routes/V1/AbstractCartRoute.php
+++ b/plugins/woocommerce/src/StoreApi/Routes/V1/AbstractCartRoute.php
@@ -188,6 +188,13 @@ abstract class AbstractCartRoute extends AbstractRoute {
 	 * @return string
 	 */
 	protected function get_cart_token() {
+		// Ensure cart is loaded.
+		$this->cart_controller->load_cart();
+
+		if ( ! wc()->session ) {
+			return null;
+		}
+
 		return JsonWebToken::create(
 			[
 				'user_id' => wc()->session->get_customer_id(),