diff --git a/wp-includes/option.php b/wp-includes/option.php
index 5d3e6fe8ef..e0e69aa519 100644
--- a/wp-includes/option.php
+++ b/wp-includes/option.php
@@ -1069,6 +1069,10 @@ function update_site_option( $option, $value ) {
 function get_network_option( $network_id, $option, $default = false ) {
 	global $wpdb, $current_site;
 
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
 	$network_id = (int) $network_id;
 
 	// Fallback to the current network if a network ID is not specified.
@@ -1182,6 +1186,10 @@ function get_network_option( $network_id, $option, $default = false ) {
 function add_network_option( $network_id, $option, $value ) {
 	global $wpdb, $current_site;
 
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
 	$network_id = (int) $network_id;
 
 	// Fallback to the current network if a network ID is not specified.
@@ -1287,6 +1295,10 @@ function add_network_option( $network_id, $option, $value ) {
 function delete_network_option( $network_id, $option ) {
 	global $wpdb, $current_site;
 
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
 	$network_id = (int) $network_id;
 
 	// Fallback to the current network if a network ID is not specified.
@@ -1366,6 +1378,10 @@ function delete_network_option( $network_id, $option ) {
 function update_network_option( $network_id, $option, $value ) {
 	global $wpdb, $current_site;
 
+	if ( $network_id && ! is_numeric( $network_id ) ) {
+		return false;
+	}
+
 	$network_id = (int) $network_id;
 
 	// Fallback to the current network if a network ID is not specified.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 05172f5700..a66bdf06bd 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-35024';
+$wp_version = '4.4-alpha-35025';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.