diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index 0f886f88f1..e7b74a6d45 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -1600,6 +1600,9 @@ class wpdb {
 		// If we're writing to the database, make sure the query will write safely.
 		if ( $this->check_current_query && ! $this->check_ascii( $query ) ) {
 			$stripped_query = $this->strip_invalid_text_from_query( $query );
+			// strip_invalid_text_from_query() can perform queries, so we need
+			// to flush again, just to make sure everything is clear.
+			$this->flush();
 			if ( $stripped_query !== $query ) {
 				$this->insert_id = 0;
 				return false;