diff --git a/lib/less/tree/variable.js b/lib/less/tree/variable.js
index fa6341965..90d862718 100644
--- a/lib/less/tree/variable.js
+++ b/lib/less/tree/variable.js
@@ -3,7 +3,7 @@
 tree.Variable = function (name, index, currentFileInfo) {
     this.name = name;
     this.index = index;
-    this.currentFileInfo = currentFileInfo;
+    this.currentFileInfo = currentFileInfo || {};
 };
 tree.Variable.prototype = {
     type: "Variable",
diff --git a/test/less/errors/javascript-undefined-var.less b/test/less/errors/javascript-undefined-var.less
new file mode 100644
index 000000000..7cd580c4a
--- /dev/null
+++ b/test/less/errors/javascript-undefined-var.less
@@ -0,0 +1,3 @@
+.scope {
+    @a: `@{b}`;
+}
diff --git a/test/less/errors/javascript-undefined-var.txt b/test/less/errors/javascript-undefined-var.txt
new file mode 100644
index 000000000..b363aff9b
--- /dev/null
+++ b/test/less/errors/javascript-undefined-var.txt
@@ -0,0 +1,4 @@
+NameError: variable @b is undefined in {path}javascript-undefined-var.less on line 2, column 15:
+1 .scope {
+2     @a: `@{b}`;
+3 }