diff --git a/warcprox/controller.py b/warcprox/controller.py
index b0eea27..954cbc1 100644
--- a/warcprox/controller.py
+++ b/warcprox/controller.py
@@ -166,8 +166,9 @@ class WarcproxController(object):
             with processor.inq.mutex:
                 l = list(processor.inq.queue)
             for recorded_url in l:
-                if not earliest or (earliest and (recorded_url.timestamp < earliest)):
-                    earliest = recorded_url.timestamp
+                if recorded_url.timestamp:
+                    if not earliest or (recorded_url.timestamp < earliest):
+                        earliest = recorded_url.timestamp
         return earliest
 
     def postfetch_status(self):