# Delivery stops after a schema change (Iceberg)
<a name="msk-data-delivery-ts-schema-change"></a>
+ **Symptom:** Delivery stops after the topic's schema changes in GSR.
+ **Causes:** Schema evolution is not supported. A schema change can make new records incompatible with the existing Iceberg table.
+ **Resolution:** Revert to the schema the Channel was created with, or delete the Channel and create a new one (with a new table) for the new schema. Check Amazon CloudWatch Logs for schema resolution errors.