diff --git a/display.php b/display.php
index f9e04d9..aee5f31 100644
--- a/display.php
+++ b/display.php
@@ -76,7 +76,7 @@ function display_information() {
 	$autorefresh             = read_user_setting('intropage_autorefresh', read_config_option('intropage_autorefresh'));
 	$important_period        = read_user_setting('intropage_important_period', read_config_option('intropage_important_period'));
 	$timespan                = read_user_setting('intropage_timespan', read_config_option('intropage_timespan'));
-	$number_of_lines         = read_user_setting('intropage_number_of_lines', read_config_option('intropage_number_of_lines'));
+	$number_of_lines         = intropage_get_lines($_SESSION['sess_user_id']);
 
 	// number of dashboards
 	$number_of_dashboards = db_fetch_cell_prepared('SELECT COUNT(*)
diff --git a/include/functions.php b/include/functions.php
index d3e763a..3025d83 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -1250,7 +1250,7 @@ class=VALUES(class),
 function intropage_favourite_graph($fav_graph_id, $fav_graph_timespan) {
 	global $config, $graph_timeshifts;
 
-	$lines = read_user_setting('intropage_number_of_lines', read_config_option('intropage_number_of_lines'), false, $_SESSION['sess_user_id']);
+	$lines = intropage_get_lines($_SESSION['sess_user_id']);
 
 	if ($lines == 5) {
 		$graph_height = 100;
@@ -1298,7 +1298,7 @@ function intropage_favourite_graph($fav_graph_id, $fav_graph_timespan) {
 function intropage_prepare_graph($dispdata, $user_id) {
 	global $config;
 
-	$lines = read_user_setting('intropage_number_of_lines', read_config_option('intropage_number_of_lines'), false, $user_id);
+	$lines = intropage_get_lines($user_id);
 
 	if ($lines == 5) {
 		$graph_height = 180;
@@ -2096,7 +2096,7 @@ function human_readable($bytes, $decimal = true, $precision = 2) {
 }
 
 function get_panel_lines_count($height, $user_id) {
-	$lines = read_user_setting('intropage_number_of_lines', read_config_option('intropage_number_of_lines'), false, $user_id);
+	$lines = intropage_get_lines($user_id);
 
 	if (!is_numeric($lines)) {
 		$lines = 5;
@@ -2108,3 +2108,13 @@ function get_panel_lines_count($height, $user_id) {
 
 	return $lines;
 }
+
+function intropage_get_lines($user_id) {
+	$lines = read_user_setting('intropage_number_of_lines', read_config_option('intropage_number_of_lines'), false, $user_id);
+
+	if (!is_numeric($lines) || $lines <= 0) {
+		$lines = 5;
+	}
+
+	return $lines;
+}
diff --git a/panellib/analyze.php b/panellib/analyze.php
index c92428f..3fb02ee 100644
--- a/panellib/analyze.php
+++ b/panellib/analyze.php
@@ -132,7 +132,7 @@ function register_analyze() {
 function analyse_login($panel, $user_id) {
 	global $config;
 
-	$lines            = read_user_setting('intropage_number_of_lines', read_config_option('intropage_number_of_lines'), false, $user_id);
+	$lines            = intropage_get_lines($user_id);
 	$important_period = read_user_setting('intropage_important_period', read_config_option('intropage_important_period'), false, $user_id);
 
 	if ($important_period == -1) {