diff --git a/cmd/vidforward/utils.go b/cmd/vidforward/utils.go
index 2d19a1b1..a93c5008 100644
--- a/cmd/vidforward/utils.go
+++ b/cmd/vidforward/utils.go
@@ -38,6 +38,9 @@ import (
 var loggingLevel = logging.Info
 
 func newRevid(log logging.Logger, urls []string) (*revid.Revid, error) {
+	if len(urls) <= 0 {
+		return nil, fmt.Errorf("cannot have %d URLs", len(urls))
+	}
 	var outputs []uint8
 	for _ = range urls {
 		outputs = append(outputs, config.OutputRTMP)