diff --git a/src/mame/drivers/pt68k4.cpp b/src/mame/drivers/pt68k4.cpp
index e5e1bfc60a5..bcc5bd7c53c 100644
--- a/src/mame/drivers/pt68k4.cpp
+++ b/src/mame/drivers/pt68k4.cpp
@@ -361,7 +361,9 @@ void pt68k4_state::machine_reset()
 		floppy_image_device *floppy = m_floppy_connector[0] ? m_floppy_connector[0]->get_device() : nullptr;
 
 		m_wdfdc->set_floppy(floppy);
-		floppy->ss_w(0);
+
+		if (floppy)
+			floppy->ss_w(0);
 
 		m_lastdrive = 0;
 	}