From 5a4605f2ea62c84454a6dbb4b81129517ddfad7e Mon Sep 17 00:00:00 2001
From: asc <42143765+asccc@users.noreply.github.com>
Date: Thu, 1 Aug 2019 21:12:13 +0200
Subject: [PATCH] Prevent ErrorException if $parts is empty

If `$level` reaches 0, `array_slice($parts, 0, $level)` returns an empty array. This will issue a "undefined index notice" in the next recursion on `$part = $parts[$level]`. This notice gets transformed to an ErrorException which will cancel further analysis.
---
 src/Index/Index.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Index/Index.php b/src/Index/Index.php
index 0d61f9ca..e8ec32ac 100644
--- a/src/Index/Index.php
+++ b/src/Index/Index.php
@@ -423,6 +423,10 @@ private function indexDefinition(int $level, array $parts, array &$storage, Defi
      */
     private function removeIndexedDefinition(int $level, array $parts, array &$storage, array &$rootStorage)
     {
+        if (empty($parts)) {
+            return;
+        }
+        
         $part = $parts[$level];
 
         if ($level + 1 === count($parts)) {