diff --git a/packages/core/postgrest-js/src/PostgrestClient.ts b/packages/core/postgrest-js/src/PostgrestClient.ts
index a20c9cf9a..6cefadd00 100644
--- a/packages/core/postgrest-js/src/PostgrestClient.ts
+++ b/packages/core/postgrest-js/src/PostgrestClient.ts
@@ -88,6 +88,10 @@ export default class PostgrestClient<
    * @param relation - The table or view name to query
    */
   from(relation: string): PostgrestQueryBuilder<ClientOptions, Schema, any, any> {
+    if (!relation || typeof relation !== 'string' || relation.trim() === '') {
+      throw new Error('Invalid relation name: relation must be a non-empty string.')
+    }
+
     const url = new URL(`${this.url}/${relation}`)
     return new PostgrestQueryBuilder(url, {
       headers: new Headers(this.headers),