diff --git a/surebet/parsing/olimp.py b/surebet/parsing/olimp.py
index 361981b..7c80444 100644
--- a/surebet/parsing/olimp.py
+++ b/surebet/parsing/olimp.py
@@ -121,7 +121,7 @@ def __init__(self, bet):
 
 
 def is_valid_team_names(first_team, second_team):
-    return not (CORNERS_STR in first_team and CORNERS_STR in second_team)
+    return first_team and second_team and not (CORNERS_STR in first_team and CORNERS_STR in second_team)
 
 
 def parse(source, bookmaker):