diff --git a/packages/turso-serverless/src/connection.ts b/packages/turso-serverless/src/connection.ts
index 907354671..a7846e8dc 100644
--- a/packages/turso-serverless/src/connection.ts
+++ b/packages/turso-serverless/src/connection.ts
@@ -17,6 +17,9 @@ export class Connection {
   private session: Session;
 
   constructor(config: Config) {
+    if (!config.url) {
+      throw new Error("invalid config: url is required");
+    }
     this.config = config;
     this.session = new Session(config);
   }