diff --git a/pkg/utils/bwlimit.go b/pkg/utils/bwlimit.go
index 202529b..c444318 100644
--- a/pkg/utils/bwlimit.go
+++ b/pkg/utils/bwlimit.go
@@ -10,5 +10,5 @@ func IsBytesLimitReached(err error) bool {
 }
 
 func AreAllTokensExpired(err error) bool {
-	return err.Error() == "all tokens are expired"
+	return err != nil && err.Error() == "all tokens are expired"
 }