diff --git a/src/disk/mo.c b/src/disk/mo.c
index ad781a8ac..dda4222ca 100644
--- a/src/disk/mo.c
+++ b/src/disk/mo.c
@@ -2152,6 +2152,9 @@ mo_hard_reset(void)
 
             mo_init(dev);
 
+            if (dev->tf == NULL)
+                continue;
+
             if (strlen(mo_drives[c].image_path))
                 mo_load(dev, mo_drives[c].image_path);
 
diff --git a/src/disk/zip.c b/src/disk/zip.c
index c498383e8..69af18e74 100644
--- a/src/disk/zip.c
+++ b/src/disk/zip.c
@@ -2391,6 +2391,9 @@ zip_hard_reset(void)
 
             zip_init(dev);
 
+            if (dev->tf == NULL)
+                continue;
+
             if (strlen(zip_drives[c].image_path))
                 zip_load(dev, zip_drives[c].image_path);