diff --git a/data/model/tag.py b/data/model/tag.py
index 345a0a391..e22156dbf 100644
--- a/data/model/tag.py
+++ b/data/model/tag.py
@@ -799,7 +799,8 @@ def populate_manifest(repository, manifest, legacy_image, storage_ids):
       manifest_row = Manifest.create(digest=manifest.digest, repository=repository,
                                      manifest_bytes=manifest.bytes.as_encoded_str(),
                                      media_type=media_type)
-    except IntegrityError:
+    except IntegrityError as ie:
+      logger.debug('Got integrity error when trying to write manifest: %s', ie)
       return Manifest.get(repository=repository, digest=manifest.digest)
 
     ManifestLegacyImage.create(manifest=manifest_row, repository=repository, image=legacy_image)