diff --git a/wp-includes/version.php b/wp-includes/version.php
index 71dc5557cf..c2f1dbb0cf 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34736';
+$wp_version = '4.4-alpha-34737';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index e52d6fd2f4..008550d2a5 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -1779,6 +1779,7 @@ class wpdb {
 	 * @param string       $table  Table name
 	 * @param array        $data   Data to insert (in column => value pairs).
 	 *                             Both $data columns and $data values should be "raw" (neither should be SQL escaped).
+	 *                             Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.
 	 * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data.
 	 *                             If string, that format will be used for all of the values in $data.
 	 *                             A format is one of '%d', '%f', '%s' (integer, float, string).
@@ -1803,6 +1804,7 @@ class wpdb {
 	 * @param string       $table  Table name
 	 * @param array        $data   Data to insert (in column => value pairs).
 	 *                             Both $data columns and $data values should be "raw" (neither should be SQL escaped).
+	 *                             Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.
 	 * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data.
 	 *                             If string, that format will be used for all of the values in $data.
 	 *                             A format is one of '%d', '%f', '%s' (integer, float, string).
@@ -1827,6 +1829,7 @@ class wpdb {
 	 * @param string       $table  Table name
 	 * @param array        $data   Data to insert (in column => value pairs).
 	 *                             Both $data columns and $data values should be "raw" (neither should be SQL escaped).
+	 *                             Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.
 	 * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data.
 	 *                             If string, that format will be used for all of the values in $data.
 	 *                             A format is one of '%d', '%f', '%s' (integer, float, string).
@@ -1848,6 +1851,11 @@ class wpdb {
 
 		$formats = $values = array();
 		foreach ( $data as $value ) {
+			if ( is_null( $value['value'] ) ) {
+				$formats[] = 'NULL';
+				continue;
+			}
+
 			$formats[] = $value['format'];
 			$values[]  = $value['value'];
 		}
@@ -1875,9 +1883,12 @@ class wpdb {
 	 * @param string       $table        Table name
 	 * @param array        $data         Data to update (in column => value pairs).
 	 *                                   Both $data columns and $data values should be "raw" (neither should be SQL escaped).
+	 *                                   Sending a null value will cause the column to be set to NULL - the corresponding
+	 *                                   format is ignored in this case.
 	 * @param array        $where        A named array of WHERE clauses (in column => value pairs).
 	 *                                   Multiple clauses will be joined with ANDs.
 	 *                                   Both $where columns and $where values should be "raw".
+	 *                                   Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case.
 	 * @param array|string $format       Optional. An array of formats to be mapped to each of the values in $data.
 	 *                                   If string, that format will be used for all of the values in $data.
 	 *                                   A format is one of '%d', '%f', '%s' (integer, float, string).
@@ -1904,10 +1915,20 @@ class wpdb {
 
 		$fields = $conditions = $values = array();
 		foreach ( $data as $field => $value ) {
+			if ( is_null( $value['value'] ) ) {
+				$fields[] = "`$field` = NULL";
+				continue;
+			}
+
 			$fields[] = "`$field` = " . $value['format'];
 			$values[] = $value['value'];
 		}
 		foreach ( $where as $field => $value ) {
+			if ( is_null( $value['value'] ) ) {
+				$conditions[] = "`$field` IS NULL";
+				continue;
+			}
+
 			$conditions[] = "`$field` = " . $value['format'];
 			$values[] = $value['value'];
 		}
@@ -1936,6 +1957,7 @@ class wpdb {
 	 * @param array        $where        A named array of WHERE clauses (in column => value pairs).
 	 *                                   Multiple clauses will be joined with ANDs.
 	 *                                   Both $where columns and $where values should be "raw".
+	 *                                   Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case.
 	 * @param array|string $where_format Optional. An array of formats to be mapped to each of the values in $where.
 	 *                                   If string, that format will be used for all of the items in $where.
 	 *                                   A format is one of '%d', '%f', '%s' (integer, float, string).
@@ -1954,6 +1976,11 @@ class wpdb {
 
 		$conditions = $values = array();
 		foreach ( $where as $field => $value ) {
+			if ( is_null( $value['value'] ) ) {
+				$conditions[] = "`$field` IS NULL";
+				continue;
+			}
+
 			$conditions[] = "`$field` = " . $value['format'];
 			$values[] = $value['value'];
 		}