diff --git a/rpcs3/Emu/Cell/Modules/cellMsgDialog.h b/rpcs3/Emu/Cell/Modules/cellMsgDialog.h
index 9c9e5dad87..af787431af 100644
--- a/rpcs3/Emu/Cell/Modules/cellMsgDialog.h
+++ b/rpcs3/Emu/Cell/Modules/cellMsgDialog.h
@@ -105,7 +105,7 @@ public:
 
 	MsgDialogType type{};
 
-	std::function<void(s32 status)> on_close;
+	std::function<void(s32 status)> on_close = nullptr;
 
 	virtual ~MsgDialogBase();
 	virtual void Create(const std::string& msg, const std::string& title = "") = 0;
diff --git a/rpcs3/Emu/system_progress.cpp b/rpcs3/Emu/system_progress.cpp
index 7c2013adee..f5248dad7b 100644
--- a/rpcs3/Emu/system_progress.cpp
+++ b/rpcs3/Emu/system_progress.cpp
@@ -81,9 +81,8 @@ void progress_dialog_server::operator()()
 			}
 		}
 
-		if (!skip_this_one && !native_dlg)
+		if (!skip_this_one && !native_dlg && (dlg = Emu.GetCallbacks().get_msg_dialog()))
 		{
-			dlg                          = Emu.GetCallbacks().get_msg_dialog();
 			dlg->type.se_normal          = true;
 			dlg->type.bg_invisible       = true;
 			dlg->type.progress_bar_count = 1;
diff --git a/rpcs3/headless_application.cpp b/rpcs3/headless_application.cpp
index 8424878d48..75470770df 100644
--- a/rpcs3/headless_application.cpp
+++ b/rpcs3/headless_application.cpp
@@ -5,6 +5,7 @@
 #include "Emu/Cell/Modules/cellOskDialog.h"
 #include "Emu/Cell/Modules/cellSaveData.h"
 #include "Emu/Cell/Modules/sceNpTrophy.h"
+#include "Emu/Io/Null/null_camera_handler.h"
 
 #include <clocale>
 
@@ -87,6 +88,23 @@ void headless_application::InitializeCallbacks()
 		}
 	};
 
+	callbacks.get_camera_handler = []() -> std::shared_ptr<camera_handler_base>
+	{
+		switch (g_cfg.io.camera.get())
+		{
+		case camera_handler::null:
+		case camera_handler::fake:
+		{
+			return std::make_shared<null_camera_handler>();
+		}
+		case camera_handler::qt:
+		{
+			fmt::throw_exception("Headless mode can not be used with this camera handler. Current handler: %s", g_cfg.io.camera.get());
+		}
+		}
+		return nullptr;
+	};
+
 	callbacks.get_gs_frame = []() -> std::unique_ptr<GSFrameBase>
 	{
 		if (g_cfg.video.renderer != video_renderer::null)
@@ -107,6 +125,10 @@ void headless_application::InitializeCallbacks()
 	callbacks.on_stop   = []() {};
 	callbacks.on_ready  = []() {};
 
+	callbacks.on_missing_fw = []() { return false; };
+
+	callbacks.handle_taskbar_progress = [](s32, s32) {};
+
 	callbacks.get_localized_string    = [](localized_string_id, const char*) -> std::string { return {}; };
 	callbacks.get_localized_u32string = [](localized_string_id, const char*) -> std::u32string { return {}; };