diff --git a/htdocs/admin/company.php b/htdocs/admin/company.php
index d8af6ac1b4f..15f4a27c8c7 100644
--- a/htdocs/admin/company.php
+++ b/htdocs/admin/company.php
@@ -666,7 +666,7 @@ print '<td class="titlefield">'.$langs->trans("FiscalYearInformation").'</td><td
 print "</tr>\n";
 
 print '<tr class="oddeven"><td><label for="SOCIETE_FISCAL_MONTH_START">'.$langs->trans("FiscalMonthStart").'</label></td><td>';
-print $formother->select_month($conf->global->SOCIETE_FISCAL_MONTH_START, 'SOCIETE_FISCAL_MONTH_START', 0, 1, 'maxwidth100').'</td></tr>';
+print (isset($conf->global->SOCIETE_FISCAL_MONTH_START) ? $formother->select_month($conf->global->SOCIETE_FISCAL_MONTH_START, 'SOCIETE_FISCAL_MONTH_START', 0, 1, 'maxwidth100') : '').'</td></tr>';
 
 print "</table>";
 print '<br>';
diff --git a/htdocs/admin/delais.php b/htdocs/admin/delais.php
index 4fe21a8460b..71783b2a319 100644
--- a/htdocs/admin/delais.php
+++ b/htdocs/admin/delais.php
@@ -289,7 +289,7 @@ if ($action == 'edit') {
 print '<br>';
 
 
-if ($conf->global->MAIN_DISABLE_METEO != 1) {
+if (isset($conf->global->MAIN_DISABLE_METEO) && $conf->global->MAIN_DISABLE_METEO != 1) {
 	// Show logo for weather
 	print '<span class="opacitymedium">'.$langs->trans("DescWeather").'</span> ';
 
diff --git a/htdocs/admin/mails.php b/htdocs/admin/mails.php
index 72d16569b25..ac23480bd4d 100644
--- a/htdocs/admin/mails.php
+++ b/htdocs/admin/mails.php
@@ -48,7 +48,7 @@ $substitutionarrayfortest = array(
 	'__DOL_MAIN_URL_ROOT__'=>DOL_MAIN_URL_ROOT,
 	'__ID__' => 'RecipientIdRecord',
 	//'__EMAIL__' => 'RecipientEMail',				// Done into actions_sendmails
-	'__CHECK_READ__' => (is_object($object) && is_object($object->thirdparty)) ? '<img src="'.DOL_MAIN_URL_ROOT.'/public/emailing/mailing-read.php?tag='.$object->thirdparty->tag.'&securitykey='.urlencode($conf->global->MAILING_EMAIL_UNSUBSCRIBE_KEY).'" width="1" height="1" style="width:1px;height:1px" border="0"/>' : '',
+	'__CHECK_READ__' => (isset($object->thirdparty) && is_object($object) && is_object($object->thirdparty)) ? '<img src="'.DOL_MAIN_URL_ROOT.'/public/emailing/mailing-read.php?tag='.$object->thirdparty->tag.'&securitykey='.urlencode($conf->global->MAILING_EMAIL_UNSUBSCRIBE_KEY).'" width="1" height="1" style="width:1px;height:1px" border="0"/>' : '',
 	'__USER_SIGNATURE__' => (($user->signature && empty($conf->global->MAIN_MAIL_DO_NOT_USE_SIGN)) ? $usersignature : ''), // Done into actions_sendmails
 	'__LOGIN__' => 'RecipientLogin',
 	'__LASTNAME__' => 'RecipientLastname',
@@ -554,7 +554,7 @@ if ($action == 'edit') {
 	print '<tr class="liste_titre"><td class="titlefieldmiddle">'.$langs->trans("Parameter").'</td><td>'.$langs->trans("Value").'</td></tr>';
 
 	// Disable
-	print '<tr class="oddeven"><td>'.$langs->trans("MAIN_DISABLE_ALL_MAILS").'</td><td>'.yn($conf->global->MAIN_DISABLE_ALL_MAILS);
+	print '<tr class="oddeven"><td>'.$langs->trans("MAIN_DISABLE_ALL_MAILS").'</td><td>'.(isset($conf->global->MAIN_DISABLE_ALL_MAILS) ? yn($conf->global->MAIN_DISABLE_ALL_MAILS) : '');
 	if (!empty($conf->global->MAIN_DISABLE_ALL_MAILS)) {
 		print img_warning($langs->trans("Disabled"));
 	}
@@ -737,26 +737,28 @@ if ($action == 'edit') {
 
 		print '<tr class="oddeven"><td>'.$langs->trans('MAIN_MAIL_DEFAULT_FROMTYPE').'</td>';
 		print '<td>';
-		if ($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE === 'robot') {
-			print $langs->trans('RobotEmail');
-		} elseif ($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE === 'user') {
-			print $langs->trans('UserEmail');
-		} elseif ($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE === 'company') {
-			print $langs->trans('CompanyEmail').' '.dol_escape_htmltag('<'.$mysoc->email.'>');
-		} else {
-			$id = preg_replace('/senderprofile_/', '', $conf->global->MAIN_MAIL_DEFAULT_FROMTYPE);
-			if ($id > 0) {
-				include_once DOL_DOCUMENT_ROOT.'/core/class/emailsenderprofile.class.php';
-				$emailsenderprofile = new EmailSenderProfile($db);
-				$emailsenderprofile->fetch($id);
-				print $emailsenderprofile->label.' '.dol_escape_htmltag('<'.$emailsenderprofile->email.'>');
+		if (isset($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE)) {
+			if ($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE === 'robot') {
+				print $langs->trans('RobotEmail');
+			} elseif ($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE === 'user') {
+				print $langs->trans('UserEmail');
+			} elseif ($conf->global->MAIN_MAIL_DEFAULT_FROMTYPE === 'company') {
+				print $langs->trans('CompanyEmail').' '.dol_escape_htmltag('<'.$mysoc->email.'>');
+			} else {
+				$id = preg_replace('/senderprofile_/', '', $conf->global->MAIN_MAIL_DEFAULT_FROMTYPE);
+				if ($id > 0) {
+					include_once DOL_DOCUMENT_ROOT.'/core/class/emailsenderprofile.class.php';
+					$emailsenderprofile = new EmailSenderProfile($db);
+					$emailsenderprofile->fetch($id);
+					print $emailsenderprofile->label.' '.dol_escape_htmltag('<'.$emailsenderprofile->email.'>');
+				}
 			}
 		}
 		print '</td></tr>';
 
 		// Errors To
 		print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_ERRORS_TO").'</td>';
-		print '<td>'.$conf->global->MAIN_MAIL_ERRORS_TO;
+		print '<td>'.(isset($conf->global->MAIN_MAIL_ERRORS_TO) ? $conf->global->MAIN_MAIL_ERRORS_TO : '');
 		if (!empty($conf->global->MAIN_MAIL_ERRORS_TO) && !isValidEmail($conf->global->MAIN_MAIL_ERRORS_TO)) {
 			print img_warning($langs->trans("ErrorBadEMail"));
 		}
@@ -776,7 +778,7 @@ if ($action == 'edit') {
 		print '</td></tr>';
 
 		//Add user to select destinaries list
-		print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_ENABLED_USER_DEST_SELECT").'</td><td>'.yn($conf->global->MAIN_MAIL_ENABLED_USER_DEST_SELECT).'</td></tr>';
+		print '<tr class="oddeven"><td>'.$langs->trans("MAIN_MAIL_ENABLED_USER_DEST_SELECT").'</td><td>'.(isset($conf->global->MAIN_MAIL_ENABLED_USER_DEST_SELECT) ? yn($conf->global->MAIN_MAIL_ENABLED_USER_DEST_SELECT) : '').'</td></tr>';
 
 		print '</table>';
 		print '</div>';
diff --git a/htdocs/core/boxes/box_dolibarr_state_board.php b/htdocs/core/boxes/box_dolibarr_state_board.php
index 7d4a290f0bc..0d2356c00ac 100644
--- a/htdocs/core/boxes/box_dolibarr_state_board.php
+++ b/htdocs/core/boxes/box_dolibarr_state_board.php
@@ -66,7 +66,7 @@ class box_dolibarr_state_board extends ModeleBoxes
 			$this->enabled = 0; // disabled by this option
 		}
 
-		$this->hidden = !($user->rights->societe->lire && empty($user->socid));
+		$this->hidden = !(isset($user->rights->societe->lire) && empty($user->socid));
 	}
 
 	/**
diff --git a/htdocs/core/lib/admin.lib.php b/htdocs/core/lib/admin.lib.php
index 3088db079e3..6769fa9ccad 100644
--- a/htdocs/core/lib/admin.lib.php
+++ b/htdocs/core/lib/admin.lib.php
@@ -1885,14 +1885,14 @@ function email_admin_prepare_head()
 		$head[$h][2] = 'common';
 		$h++;
 
-		if ($conf->mailing->enabled) {
+		if (isset($conf->mailing->enabled)) {
 			$head[$h][0] = DOL_URL_ROOT."/admin/mails_emailing.php";
 			$head[$h][1] = $langs->trans("OutGoingEmailSetupForEmailing", $langs->transnoentitiesnoconv("EMailing"));
 			$head[$h][2] = 'common_emailing';
 			$h++;
 		}
 
-		if ($conf->ticket->enabled) {
+		if (isset($conf->ticket->enabled)) {
 			$head[$h][0] = DOL_URL_ROOT."/admin/mails_ticket.php";
 			$head[$h][1] = $langs->trans("OutGoingEmailSetupForEmailing", $langs->transnoentitiesnoconv("Ticket"));
 			$head[$h][2] = 'common_ticket';
diff --git a/htdocs/core/modules/modDataPolicy.class.php b/htdocs/core/modules/modDataPolicy.class.php
index 0e2027494e7..05eaf9920bd 100644
--- a/htdocs/core/modules/modDataPolicy.class.php
+++ b/htdocs/core/modules/modDataPolicy.class.php
@@ -132,7 +132,7 @@ class modDataPolicy extends DolibarrModules {
 			array('DATAPOLICY_ADHERENT', 'chaine', '', $langs->trans('NUMBER_MONTH_BEFORE_DELETION'), 0),
 		);
 
-		$country = explode(":", $conf->global->MAIN_INFO_SOCIETE_COUNTRY);
+		if (isset($conf->global->MAIN_INFO_SOCIETE_COUNTRY)) $country = explode(":", $conf->global->MAIN_INFO_SOCIETE_COUNTRY);
 
 		// Some keys to add into the overwriting translation tables
 		/* $this->overwrite_translation = array(