Index: src/wp-includes/functions.php
===================================================================
--- src/wp-includes/functions.php	(revision 49451)
+++ src/wp-includes/functions.php	(working copy)
@@ -1757,7 +1757,7 @@
 		}
 
 		$described_table = $wpdb->get_results( "DESCRIBE $table;" );
-		if ( is_array( $described_table ) && count( $described_table ) === 0 ) {
+		if ( ! $wpdb->get_results( "DESCRIBE $table;" ) ) {
 			continue;
 		}