diff --git a/session/collector.go b/session/collector.go
index c3bf192e..672fdedd 100644
--- a/session/collector.go
+++ b/session/collector.go
@@ -313,6 +313,9 @@ func newCollector(id string, sessionsCh chan<- Session, logger log.Logger, confi
 		},
 	}
 
+	c.sessions = make(map[string]*session)
+	c.history.Sessions = make(map[string]totals)
+
 	c.staleCallback = func(sess *session) {
 		defer func() {
 			c.sessionsWG.Done()
@@ -387,10 +390,6 @@ func newCollector(id string, sessionsCh chan<- Session, logger log.Logger, confi
 		c.currentActiveSessions--
 	}
 
-	c.sessions = make(map[string]*session)
-
-	c.history.Sessions = make(map[string]totals)
-
 	c.start()
 
 	return c, nil