diff --git a/htdocs/install/step2.php b/htdocs/install/step2.php
index 9754ae78762..b3d59b2e741 100644
--- a/htdocs/install/step2.php
+++ b/htdocs/install/step2.php
@@ -570,6 +570,11 @@ dolibarr_install_syslog("Exit ".$ret);
 
 dolibarr_install_syslog("- step2: end");
 
+// Force here a value we need after because master.inc.php is not loaded into step2.
+// This code must be similar with the one into main.inc.php
+$conf->file->instance_unique_id = (empty($dolibarr_main_instance_unique_id) ? (empty($dolibarr_main_cookie_cryptkey) ? '' : $dolibarr_main_cookie_cryptkey) : $dolibarr_main_instance_unique_id); // Unique id of instance
+
+$hash_unique_id = md5('dolibarr'.$conf->file->instance_unique_id);
 
 $out  = '<input type="checkbox" name="dolibarrpingno" id="dolibarrpingno"'.((!empty($conf->global->MAIN_FIRST_PING_OK_ID) && $conf->global->MAIN_FIRST_PING_OK_ID == 'disabled') ? '' : ' value="checked" checked="true"').'> ';
 $out .= '<label for="dolibarrpingno">'.$langs->trans("MakeAnonymousPing").'</label>';
@@ -577,12 +582,15 @@ $out .= '<label for="dolibarrpingno">'.$langs->trans("MakeAnonymousPing").'</lab
 $out .= '<!-- Add js script to manage the uncheck of option to not send the ping -->';
 $out .= '<script type="text/javascript">';
 $out .= 'jQuery(document).ready(function(){';
-$out .= '  document.cookie = "DOLINSTALLNOPING_'.md5($dolibarr_main_instance_unique_id).'=0; path=/"'."\n";
+$out .= '  document.cookie = "DOLINSTALLNOPING_'.$hash_unique_id.'=0; path=/"'."\n";
 $out .= '  jQuery("#dolibarrpingno").click(function() {';
 $out .= '    if (! $(this).is(\':checked\')) {';
 $out .= '      console.log("We uncheck anonymous ping");';
-$out .= '      document.cookie = "DOLINSTALLNOPING_'.md5($dolibarr_main_instance_unique_id).'=1; path=/"'."\n";
-$out .= '    }';
+$out .= '      document.cookie = "DOLINSTALLNOPING_'.$hash_unique_id.'=1; path=/"'."\n";
+$out .= '    } else {'."\n";
+$out .= '      console.log("We check anonymous ping");';
+$out .= '      document.cookie = "DOLINSTALLNOPING_'.$hash_unique_id.'=0; path=/"'."\n";
+$out .= '    }'."\n";
 $out .= '  });';
 $out .= '});';
 $out .= '</script>';
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index a588937e2bf..2e9f0558421 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -3206,6 +3206,7 @@ if (!function_exists("llxFooter")) {
 		if (($_SERVER["PHP_SELF"] == DOL_URL_ROOT.'/index.php') || $forceping) {
 			//print '<!-- instance_unique_id='.$conf->file->instance_unique_id.' MAIN_FIRST_PING_OK_ID='.$conf->global->MAIN_FIRST_PING_OK_ID.' -->';
 			$hash_unique_id = md5('dolibarr'.$conf->file->instance_unique_id);
+
 			if (empty($conf->global->MAIN_FIRST_PING_OK_DATE)
 				|| (!empty($conf->file->instance_unique_id) && ($hash_unique_id != $conf->global->MAIN_FIRST_PING_OK_ID) && ($conf->global->MAIN_FIRST_PING_OK_ID != 'disabled'))
 			|| $forceping) {