diff --git a/src/RawHandler/MetaDataHandler.py b/src/RawHandler/MetaDataHandler.py
index a32a969..8a4e538 100644
--- a/src/RawHandler/MetaDataHandler.py
+++ b/src/RawHandler/MetaDataHandler.py
@@ -22,7 +22,7 @@ def get_ISO(metadata):
     ]
 
     exif = metadata.exifData()
-
+    val = -1
     for tag in search_tags:
         if tag in exif:
             try: