diff --git a/cmd/subscribers.go b/cmd/subscribers.go
index 306be690..f366f67c 100644
--- a/cmd/subscribers.go
+++ b/cmd/subscribers.go
@@ -462,6 +462,10 @@ func handleBlocklistSubscribersByQuery(c echo.Context) error {
 		return err
 	}
 
+	if req.Query == "" {
+		return echo.NewHTTPError(http.StatusBadRequest, app.i18n.Ts("globals.messages.invalidFields", "name", "query"))
+	}
+
 	if err := app.core.BlocklistSubscribersByQuery(req.Query, req.ListIDs, req.SubscriptionStatus); err != nil {
 		return err
 	}