diff --git a/src/Tracy/Debugger.php b/src/Tracy/Debugger.php
index 7be8e1770..b5e0d44df 100644
--- a/src/Tracy/Debugger.php
+++ b/src/Tracy/Debugger.php
@@ -138,12 +138,12 @@ final public function __construct()
 
 	/**
 	 * Enables displaying or logging errors and exceptions.
-	 * @param  mixed   production, development mode, autodetection or IP address(es) whitelist.
-	 * @param  string  error log directory
-	 * @param  string  administrator email; enables email sending in production mode
+	 * @param  mixed           production, development mode, autodetection or IP address(es) whitelist.
+	 * @param  string|ILogger  error log directory or logger instance
+	 * @param  string          administrator email; enables email sending in production mode
 	 * @return void
 	 */
-	public static function enable($mode = null, $logDirectory = null, $email = null)
+	public static function enable($mode = null, $logDirectoryOrLogger = null, $email = null)
 	{
 		if ($mode !== null || self::$productionMode === null) {
 			self::$productionMode = is_bool($mode) ? $mode : !self::detectDebugMode($mode);
@@ -159,8 +159,10 @@ public static function enable($mode = null, $logDirectory = null, $email = null)
 		if ($email !== null) {
 			self::$email = $email;
 		}
-		if ($logDirectory !== null) {
-			self::$logDirectory = $logDirectory;
+		if (is_string($logDirectoryOrLogger)) {
+			self::$logDirectory = $logDirectoryOrLogger;
+		} elseif ($logDirectoryOrLogger instanceof ILogger) {
+			self::$logger = $logDirectoryOrLogger;
 		}
 		if (self::$logDirectory) {
 			if (!preg_match('#([a-z]+:)?[/\\\\]#Ai', self::$logDirectory)) {
diff --git a/src/Tracy/StreamLogger.php b/src/Tracy/StreamLogger.php
new file mode 100644
index 000000000..db0f2cf59
--- /dev/null
+++ b/src/Tracy/StreamLogger.php
@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * This file is part of the Tracy (https://tracy.nette.org)
+ * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
+ */
+
+namespace Tracy;
+
+
+/**
+ * Logger which writes to a file.
+ */
+class StreamLogger implements ILogger
+{
+	/** @var string path to a file where errors should be logged */
+	public $path;
+
+
+	/**
+	 * @param string $path
+	 */
+	public function __construct($path)
+	{
+		$this->path = $path;
+	}
+
+
+	public function log($message, $priority = self::INFO)
+	{
+		$line = $this->formatLogLine($message);
+		if (!@file_put_contents($this->path, $line . PHP_EOL, FILE_APPEND | LOCK_EX)) { // @ is escalated to exception
+			throw new \RuntimeException("Unable to write to log file '{$this->path}'. Is directory writable?");
+		}
+	}
+
+
+	/**
+	 * @param  string|\Exception|\Throwable
+	 * @return string
+	 */
+	protected function formatLogLine($message)
+	{
+		return implode(' ', [
+			@date('[Y-m-d H-i-s]'), // @ timezone may not be set
+			preg_replace('#\s*\r?\n\s*#', ' ', $this->formatMessage($message)),
+			' @  ' . Helpers::getSource(),
+		]);
+	}
+
+
+	/**
+	 * @param  string|\Exception|\Throwable
+	 * @return string
+	 */
+	protected function formatMessage($message)
+	{
+		if ($message instanceof \Exception || $message instanceof \Throwable) {
+			while ($message) {
+				$tmp[] = ($message instanceof \ErrorException
+						? Helpers::errorTypeToString($message->getSeverity()) . ': ' . $message->getMessage()
+						: Helpers::getClass($message) . ': ' . $message->getMessage() . ($message->getCode() ? ' #' . $message->getCode() : '')
+					) . ' in ' . $message->getFile() . ':' . $message->getLine();
+				$message = $message->getPrevious();
+			}
+			$message = implode("\ncaused by ", $tmp);
+
+		} elseif (!is_string($message)) {
+			$message = Dumper::toText($message);
+		}
+
+		return trim($message);
+	}
+}