diff --git a/Applications/Terminal/main.cpp b/Applications/Terminal/main.cpp
index c539a882f2..2710fa24ac 100644
--- a/Applications/Terminal/main.cpp
+++ b/Applications/Terminal/main.cpp
@@ -76,22 +76,29 @@ int main(int argc, char** argv)
     auto menubar = make<GMenuBar>();
 
     auto app_menu = make<GMenu>("Terminal");
-    app_menu->add_item(1, "Quit");
+    app_menu->add_item(0, "Quit");
+    app_menu->on_item_activation = [] (unsigned identifier) {
+        if (identifier == 0) {
+            dbgprintf("Terminal: Quit menu activated!\n");
+            GApplication::the().exit(0);
+            return;
+        }
+    };
     menubar->add_menu(move(app_menu));
 
     auto font_menu = make<GMenu>("Font");
-    font_menu->add_item(30, "Liza Thin");
-    font_menu->add_item(31, "Liza Regular");
-    font_menu->add_item(32, "Liza Bold");
+    font_menu->add_item(0, "Liza Thin");
+    font_menu->add_item(1, "Liza Regular");
+    font_menu->add_item(2, "Liza Bold");
     font_menu->on_item_activation = [&terminal] (unsigned identifier) {
         switch (identifier) {
-        case 30:
+        case 0:
             terminal.set_font(Font::load_from_file("/res/fonts/Liza8x10.font"));
             break;
-        case 31:
+        case 1:
             terminal.set_font(Font::load_from_file("/res/fonts/LizaRegular8x10.font"));
             break;
-        case 32:
+        case 2:
             terminal.set_font(Font::load_from_file("/res/fonts/LizaBold8x10.font"));
             break;
         }
@@ -100,7 +107,7 @@ int main(int argc, char** argv)
     menubar->add_menu(move(font_menu));
 
     auto help_menu = make<GMenu>("Help");
-    help_menu->add_item(2, "About");
+    help_menu->add_item(0, "About");
     menubar->add_menu(move(help_menu));
 
     app.set_menubar(move(menubar));
diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index fb904d6ec8..cf8a4e8532 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -2133,6 +2133,7 @@ void Process::finalize()
 {
     ASSERT(current == g_finalizer);
 
+    destroy_all_menus();
     destroy_all_windows();
     m_fds.clear();
     m_tty = nullptr;
diff --git a/Kernel/Process.h b/Kernel/Process.h
index b219cb6adb..e7dfebf6b4 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -244,6 +244,7 @@ public:
     static void initialize();
     static void initialize_gui_statics();
     int make_window_id();
+    void destroy_all_menus();
     void destroy_all_windows();
 
     void crash() NORETURN;
@@ -419,6 +420,7 @@ private:
     Vector<GUI_Event> m_gui_events;
     Lock m_gui_events_lock;
     int m_next_window_id { 1 };
+    bool m_has_created_menus { false };
 
     dword m_wakeup_requested { false };
     bool m_has_used_fpu { false };
diff --git a/Kernel/ProcessGUI.cpp b/Kernel/ProcessGUI.cpp
index e97cf956c1..cc32ffc7d2 100644
--- a/Kernel/ProcessGUI.cpp
+++ b/Kernel/ProcessGUI.cpp
@@ -257,6 +257,13 @@ int Process::gui$set_global_cursor_tracking_enabled(int window_id, bool enabled)
     return 0;
 }
 
+void Process::destroy_all_menus()
+{
+    if (!m_has_created_menus)
+        return;
+    WSWindowManager::the().destroy_all_menus(*this);
+}
+
 void Process::destroy_all_windows()
 {
     for (auto& it : m_windows) {
@@ -267,7 +274,6 @@ void Process::destroy_all_windows()
     m_windows.clear();
 }
 
-
 DisplayInfo Process::set_video_resolution(int width, int height)
 {
     DisplayInfo info;
@@ -288,6 +294,7 @@ DisplayInfo Process::set_video_resolution(int width, int height)
 
 int Process::gui$menubar_create()
 {
+    m_has_created_menus = true;
     return WSWindowManager::the().api$menubar_create();
 }
 
@@ -305,6 +312,7 @@ int Process::gui$menu_create(const char* name)
 {
     if (!validate_read_str(name))
         return -EFAULT;
+    m_has_created_menus = true;
     return WSWindowManager::the().api$menu_create(String(name));
 }
 
diff --git a/LibGUI/GMenuBar.cpp b/LibGUI/GMenuBar.cpp
index 25381e77cd..18c08f1a62 100644
--- a/LibGUI/GMenuBar.cpp
+++ b/LibGUI/GMenuBar.cpp
@@ -7,6 +7,10 @@ GMenuBar::GMenuBar()
 
 GMenuBar::~GMenuBar()
 {
+    if (m_menubar_id) {
+        gui_menubar_destroy(m_menubar_id);
+        m_menubar_id = 0;
+    }
 }
 
 void GMenuBar::add_menu(OwnPtr<GMenu>&& menu)
diff --git a/WindowServer/WSMenu.h b/WindowServer/WSMenu.h
index 26f64bb5c4..24a03587f0 100644
--- a/WindowServer/WSMenu.h
+++ b/WindowServer/WSMenu.h
@@ -18,6 +18,7 @@ public:
     ~WSMenu();
 
     int menu_id() const { return m_menu_id; }
+    const Process* process() const { return m_process.ptr(); }
 
     WSMenuBar* menu_bar() { return m_menubar; }
     const WSMenuBar* menu_bar() const { return m_menubar; }
diff --git a/WindowServer/WSMenuBar.cpp b/WindowServer/WSMenuBar.cpp
index f8aa83dff8..a2d93ae8c0 100644
--- a/WindowServer/WSMenuBar.cpp
+++ b/WindowServer/WSMenuBar.cpp
@@ -3,8 +3,9 @@
 #include "WSMenuItem.h"
 #include <Kernel/Process.h>
 
-WSMenuBar::WSMenuBar(Process& process)
-    : m_process(process.make_weak_ptr())
+WSMenuBar::WSMenuBar(int menubar_id, Process& process)
+    : m_menubar_id(menubar_id)
+    , m_process(process.make_weak_ptr())
 {
 }
 
diff --git a/WindowServer/WSMenuBar.h b/WindowServer/WSMenuBar.h
index 0701412486..2aec358889 100644
--- a/WindowServer/WSMenuBar.h
+++ b/WindowServer/WSMenuBar.h
@@ -8,9 +8,11 @@ class Process;
 
 class WSMenuBar {
 public:
-    explicit WSMenuBar(Process&);
+    WSMenuBar(int menubar_id, Process&);
     ~WSMenuBar();
 
+    int menubar_id() const { return m_menubar_id; }
+    const Process* process() const { return m_process.ptr(); }
     void add_menu(WSMenu* menu) { m_menus.append(menu); }
 
     template<typename Callback>
@@ -23,6 +25,7 @@ public:
     }
 
 private:
+    int m_menubar_id { 0 };
     WeakPtr<Process> m_process;
     Vector<WSMenu*> m_menus;
 };
diff --git a/WindowServer/WSWindowManager.cpp b/WindowServer/WSWindowManager.cpp
index cd8c7cc634..5931a1899f 100644
--- a/WindowServer/WSWindowManager.cpp
+++ b/WindowServer/WSWindowManager.cpp
@@ -761,8 +761,8 @@ void WSWindowManager::flush(const Rect& a_rect)
 void WSWindowManager::close_menu(WSMenu& menu)
 {
     LOCKER(m_lock);
-    ASSERT(m_current_menu == &menu);
-    close_current_menu();
+    if (m_current_menu == &menu)
+        close_current_menu();
 }
 
 WSMenu& WSWindowManager::create_menu(String&& name)
@@ -779,8 +779,8 @@ WSMenu& WSWindowManager::create_menu(String&& name)
 int WSWindowManager::api$menubar_create()
 {
     LOCKER(m_lock);
-    auto menubar = make<WSMenuBar>(*current);
     int menubar_id = m_next_menubar_id++;
+    auto menubar = make<WSMenuBar>(menubar_id, *current);
     m_menubars.set(menubar_id, move(menubar));
     return menubar_id;
 }
@@ -793,7 +793,7 @@ int WSWindowManager::api$menubar_destroy(int menubar_id)
         return -EBADMENUBAR;
     auto& menubar = *(*it).value;
     if (&menubar == m_current_menubar)
-        ASSERT_NOT_REACHED();
+        set_current_menubar(nullptr);
     m_menubars.remove(it);
     return 0;
 }
@@ -827,6 +827,8 @@ int WSWindowManager::api$menu_destroy(int menu_id)
     auto it = m_menus.find(menu_id);
     if (it == m_menus.end())
         return -EBADMENU;
+    auto& menu = *(*it).value;
+    close_menu(menu);
     m_menus.remove(it);
     return 0;
 }
@@ -868,3 +870,33 @@ int WSWindowManager::api$app_set_menubar(int menubar_id)
     invalidate();
     return 0;
 }
+
+void WSWindowManager::destroy_all_menus(Process& process)
+{
+    LOCKER(m_lock);
+    Vector<int> menu_ids;
+    bool should_close_current_menu = false;
+    for (auto& it : m_menus) {
+        if (it.value->process() == &process)
+            menu_ids.append(it.value->menu_id());
+        if (m_current_menu == it.value.ptr())
+            should_close_current_menu = true;
+    }
+    if (should_close_current_menu)
+        close_current_menu();
+    for (int menu_id : menu_ids)
+        m_menus.remove(menu_id);
+
+    Vector<int> menubar_ids;
+    bool should_close_current_menubar = false;
+    for (auto& it : m_menubars) {
+        if (it.value->process() == &process)
+            menubar_ids.append(it.value->menubar_id());
+        if (m_current_menubar == it.value.ptr())
+            should_close_current_menubar = true;
+    }
+    if (should_close_current_menubar)
+        set_current_menubar(nullptr);
+    for (int menubar_id : menubar_ids)
+        m_menubars.remove(menubar_id);
+}
diff --git a/WindowServer/WSWindowManager.h b/WindowServer/WSWindowManager.h
index cb6949ae66..3a3adb2ecd 100644
--- a/WindowServer/WSWindowManager.h
+++ b/WindowServer/WSWindowManager.h
@@ -62,6 +62,7 @@ public:
     int api$menu_add_separator(int menu_id);
     int api$menu_add_item(int menu_id, unsigned identifier, String&& text);
     int api$app_set_menubar(int menubar_id);
+    void destroy_all_menus(Process&);
 
 private:
     WSWindowManager();