diff --git a/beat/backend/python/data.py b/beat/backend/python/data.py
index 0f9cda93909a1ac5777a57c4b3cfd22d8caba75a..a2ae3ccd9c126a9dfa8d14d8086b844ea073fae9 100755
--- a/beat/backend/python/data.py
+++ b/beat/backend/python/data.py
@@ -425,7 +425,7 @@ class CachedDataSource(DataSource):
             # Process each data unit from the file
             while True:
                 line = f.readline()
-                if line == '':
+                if not line:
                     break
 
                 offset += len(line)