Ticket #45299: 45299-bug1.diff

src/wp-includes/wp-db.php

@@ -2585 +2585 @@
                 } elseif ( $output == OBJECT_K ) {
                         // Return an array of row objects with keys from column 1
                         // (Duplicates are discarded)
-                        foreach ( $this->last_result as $row ) {
-                                $var_by_ref = get_object_vars( $row );
-                                $key        = array_shift( $var_by_ref );
-                                if ( ! isset( $new_array[ $key ] ) ) {
-                                        $new_array[ $key ] = $row;
+                        if ( $this->last_result ) {
+                                foreach ( (array) $this->last_result as $row ) {
+                                        $var_by_ref = get_object_vars( $row );
+                                        $key        = array_shift( $var_by_ref );
+                                        if ( ! isset( $new_array[ $key ] ) ) {
+                                                $new_array[ $key ] = $row;
+                                        }
                                 }
                         }
                         return $new_array;