diff --git a/system/functions.php b/system/functions.php
index fb2c0413..c3e5f91a 100644
--- a/system/functions.php
+++ b/system/functions.php
@@ -1202,7 +1202,7 @@ function convert_bytes($size)
 function log_append($file, $str)
 {
 	$f = fopen(LOGS . $file, 'a');
-	fwrite($f, $str . PHP_EOL);
+	fwrite($f, '[' . date(DateTime::RFC1123) . '] ' . $str . PHP_EOL);
 	fclose($f);
 }
 
@@ -1215,8 +1215,11 @@ function load_config_lua($filename)
 		die('ERROR: Cannot find ' . $filename . ' file.');
 
 	$tempFile = @tempnam('/tmp', 'lua');
-	$file = fopen($tempFile, 'w');
-	if(!$file) die('Cannot load server config!');
+	$file = @fopen($tempFile, 'w');
+	if(!$file) {
+		log_append('error.log', '[functions.php] Cannot load config.lua file. Error: ' . print_r(error_get_last(), true));
+		die('Cannot load server config! More info in system/logs/error.log file.');
+	}
 
 	// TODO: new parser that will also load dofile() includes
 
diff --git a/system/init.php b/system/init.php
index 7fef463a..2e21d52e 100644
--- a/system/init.php
+++ b/system/init.php
@@ -19,7 +19,7 @@ if($config['server_path'][strlen($config['server_path']) - 1] != '/')
 	$config['server_path'] .= '/';
 
 // enable gzip compression if supported by the browser
-if($config['gzip_output'] && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false) && function_exists('ob_gzhandler'))
+if($config['gzip_output'] && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false && function_exists('ob_gzhandler'))
 	ob_start('ob_gzhandler');
 
 // cache
diff --git a/system/libs/pot/OTS_Group.php b/system/libs/pot/OTS_Group.php
index 45041978..bca4c793 100644
--- a/system/libs/pot/OTS_Group.php
+++ b/system/libs/pot/OTS_Group.php
@@ -47,7 +47,7 @@ class OTS_Group extends OTS_Row_DAO implements IteratorAggregate, Countable
  *
  * @param DOMElement $group  Group info.
  */
-    public function __construct($data)
+    public function __construct($data = array())
     {
 		$this->data = $data;
     }
diff --git a/system/libs/pot/OTS_Groups_List.php b/system/libs/pot/OTS_Groups_List.php
index b9829df0..6e32cb63 100644
--- a/system/libs/pot/OTS_Groups_List.php
+++ b/system/libs/pot/OTS_Groups_List.php
@@ -51,6 +51,12 @@ class OTS_Groups_List implements IteratorAggregate, Countable
 			global $config;
 			$file = $config['data_path'] . 'XML/groups.xml';
 		}
+		
+		if(!@file_exists($file)) {
+			error('Error: Cannot load groups.xml. More info in system/logs/error.log file.');
+			log_append('error.log', '[OTS_Groups_List.php] Fatal error: Cannot load groups.xml (' . $file . '). It doesnt exist.');
+			return;
+		}
 
 		global $cache;
 
@@ -63,7 +69,9 @@ class OTS_Groups_List implements IteratorAggregate, Countable
 			else
 			{
 				$groups = new DOMDocument();
-				$groups->load($file);
+					error('Error: Cannot load groups.xml. More info in system/logs/error.log file.');
+					return;
+				}
 
 				// loads groups
 				foreach( $groups->getElementsByTagName('group') as $group)
@@ -85,8 +93,10 @@ class OTS_Groups_List implements IteratorAggregate, Countable
 		{
 			// loads DOM document
 			$groups = new DOMDocument();
-			$groups->load($file);
-
+				error('Error: Cannot load groups.xml. More info in system/logs/error.log file.');
+				return;
+			}
+			
 			// loads groups
 			foreach($groups->getElementsByTagName('group') as $group)
 			{
diff --git a/system/libs/pot/OTS_Player.php b/system/libs/pot/OTS_Player.php
index cce07abd..3b8a79aa 100644
--- a/system/libs/pot/OTS_Player.php
+++ b/system/libs/pot/OTS_Player.php
@@ -644,7 +644,8 @@ class OTS_Player extends OTS_Row_DAO
 		if($tmp)
 			return $tmp;
 
-			echo 'error while loading group..';
+		return new OTS_Group();
+			// echo 'error while loading group..';
 /*
 		$_id = $this->data['group_id'];
 		$tmpGroup = new OTS_Group;