diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index b07ecb7f4d..12e7e05a33 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1753,7 +1753,8 @@ function is_blog_installed() {
 			continue;
 		}
 
-		if ( ! $wpdb->get_results( "DESCRIBE $table;" ) ) {
+		$described_table = $wpdb->get_results( "DESCRIBE $table;" );
+		if ( is_array( $described_table ) && count( $described_table ) === 0 ) {
 			continue;
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 955968a47d..a5ffe22704 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5.2-alpha-49376';
+$wp_version = '5.5.2-alpha-49377';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.