From e0b29e269a57b020d2212c16b4562f32f2274b63 Mon Sep 17 00:00:00 2001
From: William Mortada <william@mortada.co.uk>
Date: Wed, 25 Oct 2017 15:35:47 +0100
Subject: [PATCH] Check for existence of functions in case they haven't been
 defined

---
 install/index.php | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/install/index.php b/install/index.php
index 19f20d29c8..5774078cc5 100644
--- a/install/index.php
+++ b/install/index.php
@@ -1840,9 +1840,19 @@ function getSiteDir($cmsPath, $str) {
  * @param $showRefer
  */
 function errorDisplayPage($errorTitle, $errorMsg, $showRefer = TRUE) {
+
+  // Add a link to the documentation
   if ($showRefer) {
-    $docLink = CRM_Utils_System::docURL2('Installation and Upgrades', FALSE, 'Installation Guide', NULL, NULL, "wiki");
-    $errorMsg .= '<p>' . ts("Refer to the online documentation for more information: ") . $docLink . '</p>';
+    if (is_callable(array('CRM_Utils_System', 'docURL2'))) {
+      $docLink = CRM_Utils_System::docURL2('Installation and Upgrades', FALSE, 'Installation Guide', NULL, NULL, "wiki");
+    }
+
+    if (function_exists('ts')) {
+      $errorMsg .= '<p>' . ts("Refer to the online documentation for more information: ") . $docLink . '</p>';
+    }
+    else {
+      $errorMsg .= '<p>' . 'Refer to the online documentation for more information: ' . $docLink . '</p>';
+    }
   }
 
   include 'error.html';
-- 
2.25.1