diff --git a/lib/stringify/identity.js b/lib/stringify/identity.js
index 7e542268..82c9b4fa 100644
--- a/lib/stringify/identity.js
+++ b/lib/stringify/identity.js
@@ -218,7 +218,7 @@ Compiler.prototype['custom-media'] = function(node){
 Compiler.prototype.rule = function(node){
   var indent = this.indent();
   var decls = node.declarations;
-  if (!decls.length) return '';
+  if (!decls || !decls.length) return '';
 
   return this.emit(node.selectors.map(function(s){ return indent + s }).join(',\n'), node.position)
     + this.emit(' {\n')