From e679ae0dea8c78118f7ec401a48c6c244dc929b4 Mon Sep 17 00:00:00 2001
From: Alec Smecher <alec@smecher.bc.ca>
Date: Tue, 29 Aug 2023 12:51:39 -0700
Subject: [PATCH] pkp/pkp-lib#9265 Fix fatal error on preview of unpublished
 content

---
 CoinsPlugin.php | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/CoinsPlugin.php b/CoinsPlugin.php
index f943efb..33a8c0c 100644
--- a/CoinsPlugin.php
+++ b/CoinsPlugin.php
@@ -84,10 +84,13 @@ function insertFooter(string $hookName, array $params) : bool
             ['rft.atitle', $article->getFullTitle($article->getLocale())],
             ['rft.artnum', $article->getBestArticleId()],
             ['rft.stitle', $journal->getLocalizedSetting('abbreviation')],
-            ['rft.volume', $issue->getVolume()],
-            ['rft.issue', $issue->getNumber()],
         ];
-
+	if ($issue) {
+            $vars = array_merge($vars, [
+                ['rft.volume', $issue->getVolume()],
+                ['rft.issue', $issue->getNumber()],
+            ]);
+        }
         $authors = $publication->getData('authors');
         if ($firstAuthor = $authors->first()) {
             $vars = array_merge($vars, [
@@ -97,7 +100,7 @@ function insertFooter(string $hookName, array $params) : bool
         }
 
         $datePublished = $article->getDatePublished();
-        if (!$datePublished) {
+        if (!$datePublished && $issue) {
             $datePublished = $issue->getDatePublished();
         }