diff --git a/command-parse.js b/command-parse.js
index 889bc47..880c25d 100644
--- a/command-parse.js
+++ b/command-parse.js
@@ -145,7 +145,7 @@ module.exports = function (RED) {
             let n_matches = 0;
             for (let r of this.rules) {
                 let matches = check_rule(r, token);
-                if (matches === true || (matches.length && matches.length > 0)) {
+                if (matches === true || (matches != null && matches.length && matches.length > 0)) {
                     if (matches.length > 0) {
                         msg.regex_matches[r.match_name] = matches;
                     }