diff --git a/prime_backup/action/validate_blobs_action.py b/prime_backup/action/validate_blobs_action.py
index a1dd43b..8ac6ba8 100644
--- a/prime_backup/action/validate_blobs_action.py
+++ b/prime_backup/action/validate_blobs_action.py
@@ -47,6 +47,9 @@ def validate_one_blob(blob: BlobInfo):
 				return
 
 			try:
+				# Notes: There are some codes that use `CompressMethod[blob.compress]`,
+				# which might fail hard if the blob.compress is invalid.
+				# Maybe we need to make them fail-proof somehow?
 				compressor = Compressor.create(blob.compress)
 			except ValueError:
 				result.invalid.append(BadBlobItem(blob, f'unknown compress method {blob.compress!r}'))
diff --git a/prime_backup/compressors.py b/prime_backup/compressors.py
index b3a861b..bb113d7 100644
--- a/prime_backup/compressors.py
+++ b/prime_backup/compressors.py
@@ -198,3 +198,6 @@ class CompressMethod(enum.Enum):
 	lzma = LzmaCompressor
 	zstd = ZstdCompressor
 	lz4 = Lz4Compressor
+
+	def __repr__(self) -> str:
+		return '{}({!r})'.format(self.__class__.__name__, self.name)
diff --git a/prime_backup/types/file_info.py b/prime_backup/types/file_info.py
index 868be3d..4516c61 100644
--- a/prime_backup/types/file_info.py
+++ b/prime_backup/types/file_info.py
@@ -4,6 +4,7 @@
 import stat
 from typing import Optional
 
+from prime_backup.compressors import CompressMethod
 from prime_backup.db import schema
 from prime_backup.types.blob_info import BlobInfo
 
@@ -35,15 +36,18 @@ def of(cls, file: schema.File) -> 'FileInfo':
 		"""
 		Notes: should be inside a session
 		"""
+		blob: Optional[BlobInfo] = None
 		if file.blob_hash is not None:
-			blob = BlobInfo(
-				hash=str(file.blob_hash),
-				compress=file.blob_compress,
-				raw_size=file.blob_raw_size,
-				stored_size=file.blob_stored_size,
-			)
-		else:
-			blob = None
+			if file.blob_compress not in CompressMethod.__members__:
+				from prime_backup import logger
+				logger.get().warning('Bad blob_compress {!r} for file {!r}'.format(file.blob_compress, file))
+			else:
+				blob = BlobInfo(
+					hash=str(file.blob_hash),
+					compress=CompressMethod[file.blob_compress],
+					raw_size=file.blob_raw_size,
+					stored_size=file.blob_stored_size,
+				)
 		return FileInfo(
 			backup_id=file.backup_id,
 			path=file.path,