diff --git a/logs/models.py b/logs/models.py
index b5be183d..7af5c11c 100644
--- a/logs/models.py
+++ b/logs/models.py
@@ -87,7 +87,7 @@ class ActionsSearch:
             if c is None:
                 return None
 
-            classes += c.lower()
+            classes += list(map(str.lower, c))
 
         return classes