diff --git a/core/cmdbsource.class.inc.php b/core/cmdbsource.class.inc.php
index 3ef37ae9b..376b47664 100644
--- a/core/cmdbsource.class.inc.php
+++ b/core/cmdbsource.class.inc.php
@@ -29,6 +29,100 @@ use Combodo\iTop\Core\DbConnectionWrapper;
 require_once('MyHelpers.class.inc.php');
 require_once(APPROOT.'core/kpi.class.inc.php');
 
+class MySQLException extends CoreException
+{
+	/**
+	 * MySQLException constructor.
+	 *
+	 * @param string $sIssue
+	 * @param array $aContext
+	 * @param \Exception $oException
+	 * @param \mysqli $oMysqli to use when working with a custom mysqli instance
+	 */
+	public function __construct($sIssue, $aContext, $oException = null, $oMysqli = null)
+	{
+
+		if ($oException != null)
+		{
+			$aContext['mysql_errno'] = $oException->getCode();
+			$this->code = $oException->getCode();
+			$aContext['mysql_error'] = $oException->getMessage();
+		}
+		else if ($oMysqli != null)
+		{
+			$aContext['mysql_errno'] = $oMysqli->errno;
+			$this->code = $oMysqli->errno;
+			$aContext['mysql_error'] = $oMysqli->error;
+		}
+		else
+		{
+			$aContext['mysql_errno'] = CMDBSource::GetErrNo();
+			$this->code = CMDBSource::GetErrNo();
+			$aContext['mysql_error'] = CMDBSource::GetError();
+		}
+		parent::__construct($sIssue, $aContext);
+		//if is connection error, don't log the default message with password in
+		if (mysqli_connect_errno()) {
+			error_log($this->message);
+			error_reporting(0);
+		}
+	}
+}
+
+/**
+ * Class MySQLQueryHasNoResultException
+ *
+ * @since 2.5.0
+ */
+class MySQLQueryHasNoResultException extends MySQLException
+{
+
+}
+
+/**
+ * Class MySQLHasGoneAwayException
+ *
+ * @since 2.5.0
+ * @see itop bug 1195
+ * @see https://dev.mysql.com/doc/refman/5.7/en/gone-away.html
+ */
+class MySQLHasGoneAwayException extends MySQLException
+{
+	/**
+	 * can not be a constant before PHP 5.6 (http://php.net/manual/fr/language.oop5.constants.php)
+	 *
+	 * @return int[]
+	 */
+	public static function getErrorCodes()
+	{
+		return array(
+			2006,
+			2013,
+		);
+	}
+
+	public function __construct($sIssue, $aContext)
+	{
+		parent::__construct($sIssue, $aContext, null);
+	}
+}
+
+/**
+ * @since 2.7.0 N°679
+ */
+class MySQLNoTransactionException extends MySQLException
+{
+
+}
+
+/**
+ * @since 2.7.8 3.0.3 3.1.0 N°5538
+ */
+class MySQLTransactionNotClosedException extends MySQLException
+{
+
+}
+
 
 /**
  * CMDBSource
@@ -1169,8 +1263,8 @@ class CMDBSource
 	 */
 	public static function IsSameFieldTypes($sItopGeneratedFieldType, $sDbFieldType)
 	{
-		list($sItopFieldDataType, $sItopFieldTypeOptions, $sItopFieldOtherOptions) = static::GetFieldDataTypeAndOptions($sItopGeneratedFieldType);
-		list($sDbFieldDataType, $sDbFieldTypeOptions, $sDbFieldOtherOptions) = static::GetFieldDataTypeAndOptions($sDbFieldType);
+		[$sItopFieldDataType, $sItopFieldTypeOptions, $sItopFieldOtherOptions] = static::GetFieldDataTypeAndOptions($sItopGeneratedFieldType);
+		[$sDbFieldDataType, $sDbFieldTypeOptions, $sDbFieldOtherOptions] = static::GetFieldDataTypeAndOptions($sDbFieldType);
 
 		if (strcasecmp($sItopFieldDataType, $sDbFieldDataType) !== 0)
 		{
@@ -1603,7 +1697,19 @@ class CMDBSource
 		return false;
 	}
 
-	/**
+    public static function GetClusterNb()
+    {
+        $result = 0;
+        $sSql = "SHOW STATUS LIKE 'wsrep_cluster_size';";
+        $aRows = self::QueryToArray($sSql);
+        if (count($aRows) > 0)
+        {
+            $result = $aRows[0]['Value'];
+        }
+        return intval($result);
+    }
+
+    /**
 	 * @see https://dev.mysql.com/doc/refman/5.7/en/charset-database.html
 	 * @return string query to upgrade database charset and collation if needed, null if not
 	 * @throws \MySQLException
diff --git a/js/ckeditor/package.json b/js/ckeditor/package.json
index 88c007a8e..4e970ab16 100644
--- a/js/ckeditor/package.json
+++ b/js/ckeditor/package.json
@@ -53,6 +53,7 @@
   "scripts": {
     "styles": "cp -r src/resources/styles/ build/styles",
     "build": "webpack --mode production && npm run styles",
+    "dev": "webpack --mode development --watch && npm run styles",
     "postbuild": "tsc --declaration --declarationDir build --stripInternal --emitDeclarationOnly"
   }
 }
diff --git a/js/ckeditor/src/plugins/maximize/maximize.plugin.ts b/js/ckeditor/src/plugins/maximize/maximize.plugin.ts
index 226d2287c..e8cd0f80a 100644
--- a/js/ckeditor/src/plugins/maximize/maximize.plugin.ts
+++ b/js/ckeditor/src/plugins/maximize/maximize.plugin.ts
@@ -34,17 +34,21 @@ export default class Maximize extends Plugin {
 
             this.listenTo( oButton, 'execute', () => {
                 if(oEditor.ui.element !== null){
+                    let CKEditorPoweredButton = document.getElementsByClassName('ck-powered-by-balloon');
                     if(oButton.isOn){
                         oInitialParentElement.append(oEditor.ui.element);
                         oEditor.ui.element.classList.remove('cke-maximized');
                         document.body.classList.remove('cke-maximized');
                         oButton.icon = sMaximizeIconSVG;
+                        CKEditorPoweredButton.item(0)?.setAttribute('style', 'display: block');
                     }
                     else{
                         oInitialParentElement = oEditor.ui.element.parentElement ?? oInitialParentElement;
                         oEditor.ui.element.remove();
                         document.body.append(oEditor.ui.element);
                         document.body.classList.add('cke-maximized'); // Add class to body to prevent scrollbars
+                        // Same behaviour between Chrome and Firefox (Firefox has a bug with the balloon remaning visible in the middle of the screen when the editor is maximized)
+                        CKEditorPoweredButton.item(0)?.setAttribute('style', 'display: none');
                         oEditor.ui.element.classList.add('cke-maximized');
                         oButton.icon = sMinimizeIconSVG;
                     }
diff --git a/setup/setuputils.class.inc.php b/setup/setuputils.class.inc.php
index 113c12e5d..a58ef1bdd 100644
--- a/setup/setuputils.class.inc.php
+++ b/setup/setuputils.class.inc.php
@@ -1297,6 +1297,12 @@ EOF
 				$aResult['checks'][] = new CheckResult(CheckResult::INFO, "MySQL server's max_connections is set to $iMaxConnections.");
 			}
 
+            $iClusters = $oDBSource->GetClusterNb();
+            if ($iClusters > 0) {
+                SetupLog::Warning('Warning - Galera can lead to malfunctions and data corruption. Combodo does not support this type of infrastructure.');
+                $aResult['checks'][] = new CheckResult(CheckResult::WARNING, 'Galera can lead to malfunctions and data corruption. Combodo does not support this type of infrastructure.');
+            }
+
 			try {
 				$aResult['databases'] = $oDBSource->ListDB();
 			}
@@ -1412,6 +1418,8 @@ EOF
 
 	public static function AsyncCheckDB($oPage, $aParameters)
 	{
+        SetupPage::log('Info - CheckDB');
+
 		$sDBServer = $aParameters['db_server'];
 		$sDBUser = $aParameters['db_user'];
 		$sDBPwd = $aParameters['db_pwd'];