diff --git a/config.php b/config.php
index dedc467e..f55fa6d5 100644
--- a/config.php
+++ b/config.php
@@ -230,7 +230,7 @@ $config = array(
 	'status_port' => '',
 
 	// other
-	'anonymous_usage_statistics' => false,
+	'anonymous_usage_statistics' => true,
 	'email_lai_sec_interval' => 60, // time in seconds between e-mails to one account from lost account interface, block spam
 	'google_analytics_id' => '', // e.g.: UA-XXXXXXX-X
 	'experiencetable_columns' => 5, // how many columns to display in experience table page. * experiencetable_rows, 5 = 500 (will show up to 500 level)
diff --git a/index.php b/index.php
index e1c3044f..4b33b74d 100644
--- a/index.php
+++ b/index.php
@@ -211,7 +211,8 @@ if(isset($config['anonymous_usage_statistics']) && $config['anonymous_usage_stat
 			}
 		}
 		else {
-			registerDatabaseConfig('last_usage_report', time());
+			registerDatabaseConfig('last_usage_report', time() - ($report_time - (7 * 24 * 60 * 60))); // first report after a week
+			$should_report = false;
 		}
 	}
 	
diff --git a/install/index.php b/install/index.php
index 05bd2a12..504ebed6 100644
--- a/install/index.php
+++ b/install/index.php
@@ -30,16 +30,30 @@ $steps = array(1 => 'welcome', 2 => 'license', 3 => 'requirements', 4 => 'config
 if(!in_array($step, $steps)) // check if step is valid
 	die('ERROR: Unknown step.');
 
+$errors = array();
 if($step == 'database')
 {
 	foreach($_POST['vars'] as $key => $value)
 	{
-		if(empty($value))
+		if($key != 'usage' && empty($value))
 		{
-			$step = 'config';
-			$errors = '<p class="error">' . $locale['please_fill_all'] . '</p>';
+			$errors[] = $locale['please_fill_all'];
 			break;
 		}
+		else if($key == 'mail_admin' && !Validator::email($value))
+		{
+			$errors[] = $locale['step_config_mail_admin_error'];
+			break;
+		}
+		else if($key == 'mail_address' && !Validator::email($value))
+		{
+			$errors[] = $locale['step_config_mail_address_error'];
+			break;
+		}
+	}
+
+	if(!empty($errors)) {
+		$step = 'config';
 	}
 }
 
diff --git a/install/steps/config.php b/install/steps/config.php
index 650a49e6..2d0a311b 100644
--- a/install/steps/config.php
+++ b/install/steps/config.php
@@ -79,6 +79,7 @@ echo $twig->render('install.config.html.twig', array(
 	'clients' => $clients,
 	'locale' => $locale,
 	'session' => $_SESSION,
+	'errors' => isset($errors) ? $errors : null,
 	'buttons' => next_buttons()
 ));
 ?>
\ No newline at end of file
diff --git a/system/pages/guilds/save_ranks.php b/system/pages/guilds/save_ranks.php
index 00508b1f..55f80e60 100644
--- a/system/pages/guilds/save_ranks.php
+++ b/system/pages/guilds/save_ranks.php
@@ -10,7 +10,7 @@
  */
 defined('MYAAC') or die('Direct access not allowed!');
 
-$guild_name = urldecode($_REQUEST['guild']);
+$guild_name = isset($_REQUEST['guild']) ? urldecode($_REQUEST['guild']) : null;
 if(!Validator::guildName($guild_name)) {
 	$errors[] = Validator::get;
 }
diff --git a/system/pages/guilds/show.php b/system/pages/guilds/show.php
index a6769401..061cc059 100644
--- a/system/pages/guilds/show.php
+++ b/system/pages/guilds/show.php
@@ -10,7 +10,7 @@
  */
 defined('MYAAC') or die('Direct access not allowed!');
 
-$guild_name = urldecode($_REQUEST['guild']);
+$guild_name = isset($_REQUEST['guild']) ? urldecode($_REQUEST['guild']) : null;
 if(!Validator::guildName($guild_name))
 	$errors[] = Validator::getLastError();
 
@@ -21,6 +21,7 @@ if(empty($errors))
 	if(!$guild->isLoaded())
 		$errors[] = 'Guild with name <b>'.$guild_name.'</b> doesn\'t exist.';
 }
+
 if(!empty($errors))
 {
 	echo $twig->render('error_box.html.twig', array('errors' => $errors));
diff --git a/system/templates/install.config.html.twig b/system/templates/install.config.html.twig
index 5a15246c..90548b19 100644
--- a/system/templates/install.config.html.twig
+++ b/system/templates/install.config.html.twig
@@ -20,7 +20,7 @@
 				<label for="vars_client">
 					<span>{{ locale.step_config_client }}</span>
 				</label>
-				<br>
+				<br/>
 				<select name="vars[client]" id="vars_client">
 					{% for id, version in clients %}
 					<option value="{{ id }}">{{ version }}</option>
@@ -36,7 +36,8 @@
 				<label for="vars_usage">
 					<span>{{ locale.step_config_usage }}</span>
 				</label>
-				<br>
+				<br/>
+				<input type="hidden" value="0" name="vars[usage]">
 				<input type="checkbox" name="vars[usage]" id="vars_usage" value="1" checked/>
 			</td>
 			<td>
@@ -45,5 +46,10 @@
 		</tr>
 	</table>
 
+	{% if errors is defined %}
+		{% for error in errors %}
+			<p class="error">{{ error }}</p>
+		{% endfor %}
+	{% endif %}
 	{{ buttons|raw }}
 </form>
\ No newline at end of file