diff --git a/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/integration/prestashop/exception/PrestashopApiException.java b/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/integration/prestashop/exception/PrestashopApiException.java
index bd62be5..c600601 100644
--- a/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/integration/prestashop/exception/PrestashopApiException.java
+++ b/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/integration/prestashop/exception/PrestashopApiException.java
@@ -17,6 +17,13 @@ public class PrestashopApiException extends RuntimeException {
         this.body = body;
     }
 
+    /** Use when there is no HTTP status code (e.g. inconsistent API state). */
+    public PrestashopApiException(String message) {
+        super(message);
+        this.statusCode = null;
+        this.body = null;
+    }
+
     public HttpStatusCode getStatusCode() { return statusCode; }
     public String getBody() { return body; }
 }
diff --git a/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java b/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java
index 061c4e6..33deaae 100644
--- a/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java
+++ b/sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java
@@ -98,6 +98,10 @@ public class ProductSyncService {
 
         if (existing.isEmpty()) {
             PrestashopProductDto created = prestashopClient.createProduct(toPrestashopDto(dolProduct, null));
+            if (created == null) {
+                throw new PrestashopApiException(
+                        "Product created in PS but not found via GET (reference=" + sku + ")");
+            }
             productMappingRepository.save(ProductMapping.builder()
                     .sku(sku)
                     .dolibarrId(dolProduct.id())