From 766508900de9866d147b372b3f8378829527b3cd Mon Sep 17 00:00:00 2001
From: changfeng <changfeng@gaoding.com>
Date: Mon, 5 Sep 2022 00:24:52 +0800
Subject: [PATCH] fix #167

---
 lib/LessParser.js          | 16 +++++++++-------
 lib/nodes/interpolation.js |  8 ++++++--
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/lib/LessParser.js b/lib/LessParser.js
index 098cc4e..70bae81 100644
--- a/lib/LessParser.js
+++ b/lib/LessParser.js
@@ -142,13 +142,15 @@ module.exports = class LessParser extends Parser {
       this.tokenizer.back(token);
     }
 
-    this.atrule(this.tokenizer.nextToken());
-    this.lastNode.mixin = true;
-    this.lastNode.raws.identifier = identifier;
-
-    if (important) {
-      this.lastNode.important = true;
-      this.lastNode.raws.important = important;
+    if (this.lastNode) {
+      this.atrule(this.tokenizer.nextToken());
+      this.lastNode.mixin = true;
+      this.lastNode.raws.identifier = identifier;
+  
+      if (important) {
+        this.lastNode.important = true;
+        this.lastNode.raws.important = important;
+      }
     }
   }
 
diff --git a/lib/nodes/interpolation.js b/lib/nodes/interpolation.js
index 1df4b3c..f6f678f 100644
--- a/lib/nodes/interpolation.js
+++ b/lib/nodes/interpolation.js
@@ -2,11 +2,15 @@
 
 module.exports = {
   interpolation(token) {
-    const tokens = [token, this.tokenizer.nextToken()];
+    const tokens = [token];
     const validTypes = ['word', '}'];
+    const nextToken = this.tokenizer.nextToken();
+    if (newToken) {
+      tokens.push(newToken);
+    }
 
     // look for @{ but not @[word]{
-    if (tokens[0][1].length > 1 || tokens[1][0] !== '{') {
+    if (tokens[0][1].length > 1 || (newToken && tokens[1][0] !== '{')) {
       this.tokenizer.back(tokens[1]);
       return false;
     }