diff --git a/wp-admin/includes/ajax-actions.php b/wp-admin/includes/ajax-actions.php
index 8fb348c6d3..fcc67eba19 100644
--- a/wp-admin/includes/ajax-actions.php
+++ b/wp-admin/includes/ajax-actions.php
@@ -1341,8 +1341,6 @@ function wp_ajax_add_meta() {
 		$value = wp_unslash( $_POST['meta'][$mid]['value'] );
 		if ( '' == trim($key) )
 			wp_die( __( 'Please provide a custom field name.' ) );
-		if ( '' == trim($value) )
-			wp_die( __( 'Please provide a custom field value.' ) );
 		if ( ! $meta = get_metadata_by_mid( 'post', $mid ) )
 			wp_die( 0 ); // if meta doesn't exist
 		if ( is_protected_meta( $meta->meta_key, 'post' ) || is_protected_meta( $key, 'post' ) ||
diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 015c7d32ec..a95ff78bc6 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -814,7 +814,7 @@ function add_meta( $post_ID ) {
 	if ( is_string( $metavalue ) )
 		$metavalue = trim( $metavalue );
 
-	if ( ('0' === $metavalue || ! empty ( $metavalue ) ) && ( ( ( '#NONE#' != $metakeyselect ) && !empty ( $metakeyselect) ) || !empty ( $metakeyinput ) ) ) {
+	if ( ( ( '#NONE#' != $metakeyselect ) && ! empty( $metakeyselect ) ) || ! empty( $metakeyinput ) ) {
 		/*
 		 * We have a key/value pair. If both the select and the input
 		 * for the key have data, the input takes precedence.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c0768acfe5..17d71d1452 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43810';
+$wp_version = '5.0-alpha-43811';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.