From 6eaf5bcde3148a43e8f74c4e28f23eaa6ac2baf7 Mon Sep 17 00:00:00 2001
From: Cody Finegan <cody.finegan@totaralearning.com>
Date: Thu, 14 Jul 2022 10:47:57 +1200
Subject: [PATCH] TL-34383 8.1 compatibility fixes

---
 src/Compiler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Compiler.php b/src/Compiler.php
index 9a5433b0..dd4ae8e3 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -6250,7 +6250,7 @@ protected function handleImportLoop($name)
                 continue;
             }
 
-            $file = $this->sourceNames[$env->block->sourceIndex];
+            $file = $this->sourceNames[$env->block->sourceIndex] ?? '';
 
             if ($file === null) {
                 continue;