diff --git a/htdocs/includes/odtphp/odf.php b/htdocs/includes/odtphp/odf.php
index 6c63da727b7..1a951292f94 100644
--- a/htdocs/includes/odtphp/odf.php
+++ b/htdocs/includes/odtphp/odf.php
@@ -796,7 +796,7 @@ IMG;
 
 
 		// Export to PDF using LibreOffice
-		if ($conf->global->MAIN_ODT_AS_PDF == 'libreoffice') {
+		if (getDolGlobalString('MAIN_ODT_AS_PDF') == 'libreoffice') {
 			dol_mkdir($conf->user->dir_temp);	// We must be sure the directory exists and is writable
 
 			// We delete and recreate a subdir because the soffice may have change pemrissions on it
@@ -808,7 +808,7 @@ IMG;
 			// using linux/mac libreoffice that must be in path
 			// Note PHP Config "fastcgi.impersonate=0" must set to 0 - Default is 1
 			$command ='soffice --headless -env:UserInstallation=file:\''.$conf->user->dir_temp.'/odtaspdf\' --convert-to pdf --outdir '. escapeshellarg(dirname($name)). " ".escapeshellarg($name);
-		} elseif (preg_match('/unoconv/', $conf->global->MAIN_ODT_AS_PDF)) {
+		} elseif (preg_match('/unoconv/', getDolGlobalString('MAIN_ODT_AS_PDF'))) {
 			// If issue with unoconv, see https://github.com/dagwieers/unoconv/issues/87
 
 			// MAIN_ODT_AS_PDF should be   "sudo -u unoconv /usr/bin/unoconv" and userunoconv must have sudo to be root by adding file /etc/sudoers.d/unoconv with content  www-data ALL=(unoconv) NOPASSWD: /usr/bin/unoconv .
@@ -833,17 +833,17 @@ IMG;
 			// - set shell of user to bash instead of nologin.
 			// - set permission to read/write to user on home directory /var/www so user can create the libreoffice , dconf and .cache dir and files then set permission back
 
-			$command = $conf->global->MAIN_ODT_AS_PDF.' '.escapeshellcmd($name);
+			$command = getDolGlobalString('MAIN_ODT_AS_PDF').' '.escapeshellcmd($name);
 			//$command = '/usr/bin/unoconv -vvv '.escapeshellcmd($name);
 		} else {
 			// deprecated old method using odt2pdf.sh (native, jodconverter, ...)
 			$tmpname=preg_replace('/\.odt/i', '', $name);
 
-			if (!empty($conf->global->MAIN_DOL_SCRIPTS_ROOT)) {
-				$command = $conf->global->MAIN_DOL_SCRIPTS_ROOT.'/scripts/odt2pdf/odt2pdf.sh '.escapeshellcmd($tmpname).' '.(is_numeric($conf->global->MAIN_ODT_AS_PDF)?'jodconverter':$conf->global->MAIN_ODT_AS_PDF);
+			if (getDolGlobalString('MAIN_DOL_SCRIPTS_ROOT')) {
+				$command = getDolGlobalString('MAIN_DOL_SCRIPTS_ROOT').'/scripts/odt2pdf/odt2pdf.sh '.escapeshellcmd($tmpname).' '.(is_numeric(getDolGlobalString('MAIN_ODT_AS_PDF'))?'jodconverter':getDolGlobalString('MAIN_ODT_AS_PDF'));
 			} else {
 				dol_syslog(get_class($this).'::exportAsAttachedPDF is used but the constant MAIN_DOL_SCRIPTS_ROOT with path to script directory was not defined.', LOG_WARNING);
-				$command = '../../scripts/odt2pdf/odt2pdf.sh '.escapeshellcmd($tmpname).' '.(is_numeric($conf->global->MAIN_ODT_AS_PDF)?'jodconverter':$conf->global->MAIN_ODT_AS_PDF);
+				$command = '../../scripts/odt2pdf/odt2pdf.sh '.escapeshellcmd($tmpname).' '.(is_numeric(getDolGlobalString('MAIN_ODT_AS_PDF'))?'jodconverter':getDolGlobalString('MAIN_ODT_AS_PDF'));
 			}
 		}