From 66d056d8ccf9613a65a4f56cfe96532d5c13b64b Mon Sep 17 00:00:00 2001
From: Aggiekev <kevin@nextafter.com>
Date: Wed, 24 Jul 2024 21:05:02 -0500
Subject: [PATCH] Load Empty Presentation

Allow for an empty base presentation to have slides added to it
---
 Presentation/Resource/Presentation.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Presentation/Resource/Presentation.php b/Presentation/Resource/Presentation.php
index a6a52e1..bae98ca 100644
--- a/Presentation/Resource/Presentation.php
+++ b/Presentation/Resource/Presentation.php
@@ -26,7 +26,11 @@ public function addResource(ResourceInterface $resource): ?string
             $currentSlides = $this->content->xpath('p:sldIdLst/p:sldId');
 
             $ref = $this->content->xpath('p:sldIdLst')[0]->addChild('sldId');
-            $ref->addAttribute('id', (int)end($currentSlides)['id'] + 1);
+            if(count($currentSlides) > 0)
+                $ref->addAttribute('id', (int)end($currentSlides)['id'] + 1);
+            else
+                $ref->addAttribute('id', 1);
+
             $ref->addAttribute('r:id', $rId, $this->namespaces['r']);
 
             return $rId;