diff --git a/src/client.py b/src/client.py
index 3367205..b2a5d69 100644
--- a/src/client.py
+++ b/src/client.py
@@ -1271,6 +1271,7 @@ class MCGCache():
 
 
     def __init__(self, host, size):
+        self._logger = logging.getLogger(__name__)
         self._host = host
         self._size = size
         self._dirname = os.path.expanduser(os.path.join(MCGCache.DIRNAME, host))
@@ -1290,7 +1291,11 @@ class MCGCache():
         filename = os.path.join(self._dirname, MCGCache.SIZE_FILENAME)
         if os.path.exists(filename):
             with open(filename, 'r') as f:
-                size = int(f.readline())
+                try:
+                    size = int(f.readline())
+                except:
+                    self._logger.warning("invalid cache file: %s, deleting file", filename, exc_info=True)
+                    size = None
         # Clear cache if size has changed
         if size != self._size:
             self._clear()