diff --git a/internal/actions/open/open.go b/internal/actions/open/open.go
index baa3b7f..6d3d786 100644
--- a/internal/actions/open/open.go
+++ b/internal/actions/open/open.go
@@ -4,6 +4,7 @@ Package open implements an [actions.Runner] that opens a notification in the bro
 package open
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"log/slog"
@@ -23,6 +24,10 @@ func (a *Runner) Run(n *notifications.Notification, _ []string, w io.Writer) err
 
 	browser := browser.New("", w, w)
 
+	if n.Subject.HtmlUrl == "" {
+		return errors.New("no URL to open")
+	}
+
 	err := browser.Browse(n.Subject.HtmlUrl)
 	fmt.Fprint(w, colors.Blue("OPEN ")+n.Subject.URL)