diff --git a/src/event/server_events.c b/src/event/server_events.c
index ce0da5b8..8ceb9f22 100644
--- a/src/event/server_events.c
+++ b/src/event/server_events.c
@@ -146,8 +146,9 @@ void
 sv_ev_room_subject(const char *const room, const char *const nick, const char *const subject)
 {
     muc_set_subject(room, subject);
-    if (muc_roster_complete(room)) {
-        mucwin_subject(room, nick, subject);
+    ProfMucWin *mucwin = wins_get_muc(room);
+    if (mucwin && muc_roster_complete(room)) {
+        mucwin_subject(mucwin, nick, subject);
     }
 }
 
@@ -581,8 +582,8 @@ sv_ev_muc_self_online(const char *const room, const char *const nick, gboolean c
         }
 
         char *subject = muc_subject(room);
-        if (subject) {
-            mucwin_subject(room, NULL, subject);
+        if (mucwin && subject) {
+            mucwin_subject(mucwin, NULL, subject);
         }
 
         GList *pending_broadcasts = muc_pending_broadcasts(room);
diff --git a/src/ui/mucwin.c b/src/ui/mucwin.c
index 9b77cf7d..238db218 100644
--- a/src/ui/mucwin.c
+++ b/src/ui/mucwin.c
@@ -463,38 +463,36 @@ mucwin_requires_config(ProfMucWin *mucwin)
 }
 
 void
-mucwin_subject(const char *const roomjid, const char *const nick, const char *const subject)
+mucwin_subject(ProfMucWin *mucwin, const char *const nick, const char *const subject)
 {
-    ProfWin *window = (ProfWin*)wins_get_muc(roomjid);
-    if (window == NULL) {
-        log_error("Received room subject, but no window open for %s.", roomjid);
+    assert(mucwin != NULL);
+
+    ProfWin *window = (ProfWin*)mucwin;
+    int num = wins_get_num(window);
+
+    if (subject) {
+        if (nick) {
+            win_vprint(window, '!', 0, NULL, NO_EOL, THEME_ROOMINFO, "", "*%s has set the room subject: ", nick);
+            win_vprint(window, '!', 0, NULL, NO_DATE, 0, "", "%s", subject);
+        } else {
+            win_vprint(window, '!', 0, NULL, NO_EOL, THEME_ROOMINFO, "", "Room subject: ");
+            win_vprint(window, '!', 0, NULL, NO_DATE, 0, "", "%s", subject);
+        }
     } else {
-        int num = wins_get_num(window);
-
-        if (subject) {
-            if (nick) {
-                win_vprint(window, '!', 0, NULL, NO_EOL, THEME_ROOMINFO, "", "*%s has set the room subject: ", nick);
-                win_vprint(window, '!', 0, NULL, NO_DATE, 0, "", "%s", subject);
-            } else {
-                win_vprint(window, '!', 0, NULL, NO_EOL, THEME_ROOMINFO, "", "Room subject: ");
-                win_vprint(window, '!', 0, NULL, NO_DATE, 0, "", "%s", subject);
-            }
+        if (nick) {
+            win_vprint(window, '!', 0, NULL, 0, THEME_ROOMINFO, "", "*%s has cleared the room subject.", nick);
         } else {
-            if (nick) {
-                win_vprint(window, '!', 0, NULL, 0, THEME_ROOMINFO, "", "*%s has cleared the room subject.", nick);
-            } else {
-                win_vprint(window, '!', 0, NULL, 0, THEME_ROOMINFO, "", "Room subject cleared");
-            }
+            win_vprint(window, '!', 0, NULL, 0, THEME_ROOMINFO, "", "Room subject cleared");
         }
+    }
 
-        // currently in groupchat window
-        if (wins_is_current(window)) {
-            status_bar_active(num);
+    // currently in groupchat window
+    if (wins_is_current(window)) {
+        status_bar_active(num);
 
-        // not currently on groupchat window
-        } else {
-            status_bar_active(num);
-        }
+    // not currently on groupchat window
+    } else {
+        status_bar_active(num);
     }
 }
 
diff --git a/src/ui/ui.h b/src/ui/ui.h
index a85e429f..3ce0fea7 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -175,7 +175,7 @@ void mucwin_occupant_role_and_affiliation_change(ProfMucWin *mucwin, const char
 void mucwin_roster(ProfMucWin *mucwin, GList *occupants, const char *const presence);
 void mucwin_history(ProfMucWin *mucwin, const char *const nick, GDateTime *timestamp, const char *const message);
 void mucwin_message(ProfMucWin *mucwin, const char *const nick, const char *const message);
-void mucwin_subject(const char *const roomjid, const char *const nick, const char *const subject);
+void mucwin_subject(ProfMucWin *mucwin, const char *const nick, const char *const subject);
 void mucwin_requires_config(ProfMucWin *mucwin);
 void mucwin_info(ProfMucWin *mucwin);
 void mucwin_show_role_list(ProfMucWin *mucwin, muc_role_t role);
diff --git a/tests/unittests/ui/stub_ui.c b/tests/unittests/ui/stub_ui.c
index 41d240dc..35ecc824 100644
--- a/tests/unittests/ui/stub_ui.c
+++ b/tests/unittests/ui/stub_ui.c
@@ -206,7 +206,7 @@ void mucwin_occupant_role_and_affiliation_change(ProfMucWin *mucwin, const char
 void mucwin_roster(ProfMucWin *mucwin, GList *occupants, const char * const presence) {}
 void mucwin_history(ProfMucWin *mucwin, const char * const nick, GDateTime *timestamp, const char * const message) {}
 void mucwin_message(ProfMucWin *mucwin, const char * const nick, const char * const message) {}
-void mucwin_subject(const char * const roomjid, const char * const nick, const char * const subject) {}
+void mucwin_subject(ProfMucWin *mucwin, const char * const nick, const char * const subject) {}
 void mucwin_requires_config(ProfMucWin *mucwin) {}
 void ui_room_destroy(const char * const roomjid) {}
 void mucwin_info(ProfMucWin *mucwin) {}