diff --git a/image_classifier/image_classifier.py b/image_classifier/image_classifier.py
index 1e53b85..8b8320c 100755
--- a/image_classifier/image_classifier.py
+++ b/image_classifier/image_classifier.py
@@ -101,7 +101,10 @@ class image_classifier:
         self.exif_info.set("user_comment", json.dumps(data))
 
     def is_json(self, data):
-        result = json.loads(data)
+        try:
+            result = json.loads(data)
+        except TypeError:
+            return False
         return True
 
     def load_known_people(self):