diff --git a/application/exceptions/CoreException.php b/application/exceptions/CoreException.php
index eba5616f3a..5e26173b87 100644
--- a/application/exceptions/CoreException.php
+++ b/application/exceptions/CoreException.php
@@ -5,7 +5,9 @@
  * @license     http://opensource.org/licenses/AGPL-3.0
  */
 
-class CoreException extends Exception
+use Combodo\iTop\Exception\ItopException;
+
+class CoreException extends ItopException
 {
 	protected $m_sIssue;
 	protected $m_sImpact;
diff --git a/application/startup.inc.php b/application/startup.inc.php
index 73460293b5..f5dfd4bd6f 100644
--- a/application/startup.inc.php
+++ b/application/startup.inc.php
@@ -16,6 +16,7 @@
 //
 //   You should have received a copy of the GNU Affero General Public License
 //   along with iTop. If not, see <http://www.gnu.org/licenses/>
+use Combodo\iTop\Application\Helper\ExceptionHandlerHelper;
 use Combodo\iTop\Application\Helper\Session;
 
 require_once(APPROOT.'core/cmdbobject.class.inc.php');
@@ -63,6 +64,9 @@ register_shutdown_function(function () {
 		}
 	}
 });
+
+set_exception_handler([ExceptionHandlerHelper::class, 'HandleException']);
+
 $oKPI = new ExecutionKPI();
 Session::Start();
 $oKPI->ComputeAndReport("Session Start");
diff --git a/core/log.class.inc.php b/core/log.class.inc.php
index deb4349751..234e909cf4 100644
--- a/core/log.class.inc.php
+++ b/core/log.class.inc.php
@@ -614,6 +614,12 @@ class LogChannels
 	 * @since 3.2.0
 	 */
 	public const SECURITY = 'Security';
+
+	/**
+	 * @var string
+	 * @since 3.3.0
+	 */
+	public const EXCEPTION = 'Exception';
 }
 
 abstract class LogAPI
@@ -708,8 +714,14 @@ abstract class LogAPI
 
 	private static function PrepareErrorLog(string $sMessage, throwable $oException, array $aContext, bool $isPrevious = false): array
 	{
-		$aContext['Error Message'] = $oException->getMessage();
-		$aContext['Stack Trace'] = $oException->getTraceAsString();
+		$aContext['exception'] = get_class($oException);
+		$aContext['message'] = $oException->getMessage();
+		$aContext['stack'] = $oException->getTraceAsString();
+
+		if(method_exists($oException, 'GetContext')) {
+			$aContext = array_merge($aContext, $oException->GetContext());
+		}
+
 		return ['message' => ($isPrevious ? "Previous " : '')."Exception: $sMessage", 'context' => $aContext];
 	}
 
diff --git a/lib/composer/autoload_classmap.php b/lib/composer/autoload_classmap.php
index 50b73aabc9..49bbb7ea6a 100644
--- a/lib/composer/autoload_classmap.php
+++ b/lib/composer/autoload_classmap.php
@@ -132,6 +132,7 @@ return array(
     'Combodo\\iTop\\Application\\Branding' => $baseDir . '/sources/Application/Branding.php',
     'Combodo\\iTop\\Application\\EventRegister\\ApplicationEvents' => $baseDir . '/sources/Application/EventRegister/ApplicationEvents.php',
     'Combodo\\iTop\\Application\\Helper\\CKEditorHelper' => $baseDir . '/sources/Application/Helper/CKEditorHelper.php',
+    'Combodo\\iTop\\Application\\Helper\\ExceptionHandlerHelper' => $baseDir . '/sources/Application/Helper/ExceptionHandlerHelper.php',
     'Combodo\\iTop\\Application\\Helper\\ExportHelper' => $baseDir . '/sources/Application/Helper/ExportHelper.php',
     'Combodo\\iTop\\Application\\Helper\\FormHelper' => $baseDir . '/sources/Application/Helper/FormHelper.php',
     'Combodo\\iTop\\Application\\Helper\\ImportHelper' => $baseDir . '/sources/Application/Helper/ImportHelper.php',
@@ -444,6 +445,7 @@ return array(
     'Combodo\\iTop\\Dependencies\\NPM\\iTopNPM' => $baseDir . '/sources/Dependencies/NPM/iTopNPM.php',
     'Combodo\\iTop\\DesignDocument' => $baseDir . '/core/designdocument.class.inc.php',
     'Combodo\\iTop\\DesignElement' => $baseDir . '/core/designdocument.class.inc.php',
+    'Combodo\\iTop\\Exception\\ItopException' => $baseDir . '/sources/Exception/ItopException.php',
     'Combodo\\iTop\\Form\\Field\\AbstractSimpleField' => $baseDir . '/sources/Form/Field/AbstractSimpleField.php',
     'Combodo\\iTop\\Form\\Field\\BlobField' => $baseDir . '/sources/Form/Field/BlobField.php',
     'Combodo\\iTop\\Form\\Field\\CaseLogField' => $baseDir . '/sources/Form/Field/CaseLogField.php',
diff --git a/lib/composer/autoload_static.php b/lib/composer/autoload_static.php
index 2c315e4f0e..9d1ba0d725 100644
--- a/lib/composer/autoload_static.php
+++ b/lib/composer/autoload_static.php
@@ -533,6 +533,7 @@ class ComposerStaticInitfc0e9e9dea11dcbb6272414776c30685
         'Combodo\\iTop\\Application\\Branding' => __DIR__ . '/../..' . '/sources/Application/Branding.php',
         'Combodo\\iTop\\Application\\EventRegister\\ApplicationEvents' => __DIR__ . '/../..' . '/sources/Application/EventRegister/ApplicationEvents.php',
         'Combodo\\iTop\\Application\\Helper\\CKEditorHelper' => __DIR__ . '/../..' . '/sources/Application/Helper/CKEditorHelper.php',
+        'Combodo\\iTop\\Application\\Helper\\ExceptionHandlerHelper' => __DIR__ . '/../..' . '/sources/Application/Helper/ExceptionHandlerHelper.php',
         'Combodo\\iTop\\Application\\Helper\\ExportHelper' => __DIR__ . '/../..' . '/sources/Application/Helper/ExportHelper.php',
         'Combodo\\iTop\\Application\\Helper\\FormHelper' => __DIR__ . '/../..' . '/sources/Application/Helper/FormHelper.php',
         'Combodo\\iTop\\Application\\Helper\\ImportHelper' => __DIR__ . '/../..' . '/sources/Application/Helper/ImportHelper.php',
@@ -845,6 +846,7 @@ class ComposerStaticInitfc0e9e9dea11dcbb6272414776c30685
         'Combodo\\iTop\\Dependencies\\NPM\\iTopNPM' => __DIR__ . '/../..' . '/sources/Dependencies/NPM/iTopNPM.php',
         'Combodo\\iTop\\DesignDocument' => __DIR__ . '/../..' . '/core/designdocument.class.inc.php',
         'Combodo\\iTop\\DesignElement' => __DIR__ . '/../..' . '/core/designdocument.class.inc.php',
+        'Combodo\\iTop\\Exception\\ItopException' => __DIR__ . '/../..' . '/sources/Exception/ItopException.php',
         'Combodo\\iTop\\Form\\Field\\AbstractSimpleField' => __DIR__ . '/../..' . '/sources/Form/Field/AbstractSimpleField.php',
         'Combodo\\iTop\\Form\\Field\\BlobField' => __DIR__ . '/../..' . '/sources/Form/Field/BlobField.php',
         'Combodo\\iTop\\Form\\Field\\CaseLogField' => __DIR__ . '/../..' . '/sources/Form/Field/CaseLogField.php',
diff --git a/pages/UI.php b/pages/UI.php
index 2761915084..a2c949b313 100644
--- a/pages/UI.php
+++ b/pages/UI.php
@@ -19,12 +19,12 @@ use Combodo\iTop\Application\UI\Base\Component\Toolbar\ToolbarUIBlockFactory;
 use Combodo\iTop\Application\UI\Base\Layout\PageContent\PageContentFactory;
 use Combodo\iTop\Application\UI\Base\Layout\UIContentBlock;
 use Combodo\iTop\Application\UI\Base\Layout\UIContentBlockUIBlockFactory;
-use Combodo\iTop\Application\WebPage\ErrorPage;
 use Combodo\iTop\Application\WebPage\iTopWebPage;
 use Combodo\iTop\Application\WebPage\WebPage;
 use Combodo\iTop\Application\WelcomePopup\WelcomePopupService;
 use Combodo\iTop\Controller\Base\Layout\ObjectController;
 use Combodo\iTop\Controller\WelcomePopupController;
+use Combodo\iTop\Exception\ItopException;
 use Combodo\iTop\Service\Router\Router;
 
 /**
@@ -1303,39 +1303,9 @@ try {
 	$oKPI->ComputeAndReport('Compute page');
 	$oP->output();
 } catch (Exception $e) {
-	$oErrorPage = new ErrorPage(Dict::S('UI:PageTitle:FatalError'));
-	if ($e instanceof SecurityException) {
-		$oErrorPage->add("<h1>".Dict::S('UI:SystemIntrusion')."</h1>\n");
-	} else {
-		$oErrorPage->add("<h1>".Dict::S('UI:FatalErrorMessage')."</h1>\n");
-	}
-	$sErrorDetails = ($e instanceof CoreException) ? $e->getHtmlDesc() : $e->getMessage();
-	$oErrorPage->error(Dict::Format('UI:Error_Details', utils::EscapeHtml($sErrorDetails)), $e);
-	$oErrorPage->output();
-
-	$sErrorStackTrace = ($e instanceof CoreException) ? $e->getFullStackTraceAsString() : $e->getTraceAsString();
-	if (MetaModel::IsLogEnabledIssue()) {
-		if (MetaModel::IsValidClass('EventIssue')) {
-			try {
-				$oLog = new EventIssue();
-
-				$oLog->Set('message', $e->getMessage());
-				$oLog->Set('userinfo', '');
-				$sIssue = ($e instanceof CoreException) ? $e->GetIssue() : 'PHP Exception';
-				$oLog->Set('issue', $sIssue);
-				$oLog->Set('impact', 'Page could not be displayed');
-				$oLog->Set('callstack', $sErrorStackTrace);
-				$aData = ($e instanceof CoreException) ? $e->getContextData() : [];
-				$oLog->Set('data', $aData);
-				$oLog->DBInsertNoReload();
-			} catch (Exception $e) {
-				IssueLog::Exception("Failed to log issue into the DB", $e);
-			}
-		}
-	}
-
-	$sOperationToLog = $operation ?? 'N/A';
-	IssueLog::Debug('UI.php operation='.$sOperationToLog.', error='.$e->getMessage()."\n".$sErrorStackTrace, LogChannels::CONSOLE);
+	throw new ItopException("Unable to handle UI operation", previous: $e, aContext: [
+		'operation' => ($operation ?? 'N/A'),
+	]);
 }
 
 class UI
diff --git a/sources/Application/Helper/ExceptionHandlerHelper.php b/sources/Application/Helper/ExceptionHandlerHelper.php
new file mode 100644
index 0000000000..af83f241ce
--- /dev/null
+++ b/sources/Application/Helper/ExceptionHandlerHelper.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Combodo\iTop\Application\Helper;
+
+use Combodo\iTop\Application\WebPage\ErrorPage;
+use IssueLog;
+use Throwable;
+
+class ExceptionHandlerHelper
+{
+	static array $aSupportedMimeTypes = [
+		'application/json' => 'json',
+		'application/xml'  => 'xml',
+		'text/html'        => 'html',
+		'text/plain'       => 'text',
+	];
+
+	public static function HandleException(Throwable $oException)
+	{
+		ob_end_clean();
+
+		// Log the exception
+		IssueLog::Exception('Fatal error', $oException);
+
+		$mime = self::NegotiateMimeType();
+
+		if ($mime === null) {
+			http_response_code(406);
+			header('Content-Type: application/json; charset=utf-8');
+			header('Vary: Accept');
+			echo json_encode(['error' => 'Not Acceptable'], JSON_UNESCAPED_UNICODE);
+			return;
+		}
+
+		http_response_code(500);
+		header("Content-Type: {$mime}; charset=utf-8");
+		header('Vary: Accept');
+
+		switch (self::$aSupportedMimeTypes[$mime]) {
+			case 'json':
+//				echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+				break;
+
+			case 'xml':
+				// Version simple: sérialisation minimale
+//				$xml = new SimpleXMLElement('<response/>');
+//				array_walk_recursive((array)$data, function ($value, $key) use ($xml) {
+//					$xml->addChild((string)$key, htmlspecialchars((string)$value, ENT_QUOTES | ENT_XML1, 'UTF-8'));
+//				});
+//				echo $xml->asXML();
+				break;
+
+			case 'html':
+				// Create error page
+				$oErrorPage = new ErrorPage('Fatal error');
+				$oErrorPage->error('We are sorry, an unexpected error has occurred. Please try again later.<br><br>', $oException);
+				$oErrorPage->output();
+				break;
+
+			case 'text':
+				echo 'Fatal error';
+				break;
+
+		}
+	}
+
+	public static function NegotiateMimeType(): ?string
+	{
+		$supportedMimes = array_keys(self::$aSupportedMimeTypes);
+		$acceptHeader = $_SERVER['HTTP_ACCEPT'] ?? '*/*';
+
+		if (trim($acceptHeader) === '' || $acceptHeader === '*/*') {
+			return in_array('application/json', $supportedMimes, true) ? 'application/json' : $supportedMimes[0];
+		}
+
+		$accepted = [];
+		foreach (explode(',', $acceptHeader) as $part) {
+			$part = trim($part);
+			$q = 1.0;
+			if (str_contains($part, ';')) {
+				[$type, $params] = array_map('trim', explode(';', $part, 2));
+				if (preg_match('/q=([0-9.]+)/', $params, $m)) {
+					$q = (float)$m[1];
+				}
+			} else {
+				$type = $part;
+			}
+			$accepted[] = ['type' => $type, 'q' => $q];
+		}
+
+		usort($accepted, fn($a, $b) => $b['q'] <=> $a['q']);
+
+		foreach ($accepted as $a) {
+			foreach ($supportedMimes as $mime) {
+				if ($a['type'] === $mime || $a['type'] === '*/*') {
+					return $mime;
+				}
+				// Ex: application/* match application/json
+				if (str_ends_with($a['type'], '/*')) {
+					$prefix = explode('/', $a['type'])[0].'/';
+					if (str_starts_with($mime, $prefix)) {
+						return $mime;
+					}
+				}
+			}
+		}
+
+		return null;
+	}
+}
\ No newline at end of file
diff --git a/sources/Exception/ItopException.php b/sources/Exception/ItopException.php
new file mode 100644
index 0000000000..763a6e3795
--- /dev/null
+++ b/sources/Exception/ItopException.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Combodo\iTop\Exception;
+
+use Exception;
+use IssueLog;
+use LogChannels;
+use Throwable;
+
+class ItopException extends Exception
+{
+	private array $aContext;
+
+	public function __construct(string $message = '', int $code = 0, ?Throwable $previous = null, array $aContext = [])
+	{
+		$aContext['code'] = $code;
+		IssueLog::Debug($message, LogChannels::EXCEPTION, $aContext);
+		parent::__construct($message, $code, $previous);
+		$this->aContext = $aContext;
+	}
+
+	public function getContext(): array
+	{
+		return $this->aContext;
+	}
+
+
+}
\ No newline at end of file