1.7.3

dist/liquid.js

@@ -671,6 +671,8 @@ var operators = {
         return l <= r;
     },
     'contains': function contains(l, r) {
+        if (!l) return false;
+        if (typeof l.indexOf !== 'function') return false;
         return l.indexOf(r) > -1;
     },
     'and': function and(l, r) {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "shopify-liquid",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "description": "A feature-rich Liquid template engine for Node.js and browsers, with compliance with the Ruby version.",
   "main": "index.js",
   "scripts": {