diff --git a/index.php b/index.php
index 40063fa6e0..0a2f15f9f5 100755
--- a/index.php
+++ b/index.php
@@ -30,8 +30,9 @@ try {
 	OC::handleRequest();
 
 } catch (Exception $ex) {
+	\OCP\Util::logException('index', $ex);
+
 	//show the user a detailed error page
-	\OCP\Util::writeLog('index', $ex->getMessage(), \OCP\Util::FATAL);
 	OC_Response::setStatus(OC_Response::STATUS_INTERNAL_SERVER_ERROR);
 	OC_Template::printExceptionErrorPage($ex);
 }
diff --git a/lib/public/util.php b/lib/public/util.php
index b33f07b55e..ed0622b8d1 100644
--- a/lib/public/util.php
+++ b/lib/public/util.php
@@ -77,6 +77,39 @@ class Util {
 		\OC_LOG::write( $app, $message, $level );
 	}
 
+	/**
+	 * @brief write exception into the log. Include the stack trace
+	 * if DEBUG mode is enabled
+	 * @param Exception $ex exception to log
+	 */
+	public static function logException( $app, \Exception $ex ) {
+		$message = $ex->getMessage();
+		if ($ex->getCode()) {
+			$message .= ' [' . $ex->getCode() . ']';
+		}
+		\OCP\Util::writeLog($app, 'Exception: ' . $message, \OCP\Util::FATAL);
+		if (defined('DEBUG') and DEBUG) {
+			// also log stack trace
+			$stack = explode('#', $ex->getTraceAsString());
+			// first element is empty
+			array_shift($stack);
+			foreach ($stack as $s) {
+				\OCP\Util::writeLog($app, 'Exception: ' . $s, \OCP\Util::FATAL);
+			}
+
+			// include cause
+			$l = \OC_L10N::get('lib');
+			while (method_exists($ex, 'getPrevious') && $ex = $ex->getPrevious()) {
+				$message .= ' - '.$l->t('Caused by:').' ';
+				$message .= $ex->getMessage();
+				if ($ex->getCode()) {
+					$message .= '[' . $ex->getCode() . '] ';
+				}
+				\OCP\Util::writeLog($app, 'Exception: ' . $message, \OCP\Util::FATAL);
+			}
+		}
+	}
+
 	/**
 	 * @brief get l10n object
 	 * @param string $app