- subject_relation = g_relation_new(2);
- g_relation_index(subject_relation, 0, g_str_hash, g_str_equal);
+
+ if (prefs_common.thread_by_subject) {
+ subject_relation = g_relation_new(2);
+ g_relation_index(subject_relation, 0, g_str_hash, g_str_equal);
+ }