From f50353a9521dca7503be4127c49022ed14b4d594 Mon Sep 17 00:00:00 2001
From: David Li <dli7319@gmail.com>
Date: Wed, 27 Feb 2019 14:39:56 -0500
Subject: [PATCH] Check if each variable is in the symbol table. Delete if not
 before passing into compact.

---
 lib/Minify/App.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/Minify/App.php b/lib/Minify/App.php
index 2714441..9ee4a1e 100644
--- a/lib/Minify/App.php
+++ b/lib/Minify/App.php
@@ -80,6 +80,11 @@ class App extends Container
             };
             $varNames = array_map($prefixer, $propNames);
 
+            $varDefinedChecker = function ($name) {
+                return array_key_exists($name, get_defined_vars());
+            };
+            $varNames = array_filter($varNames, $varDefinedChecker);
+
             $vars = compact($varNames);
 
             foreach ($varNames as $varName) {