1 files changed, 4 insertions, 0 deletions
diff --git a/monitor.c b/monitor.c
index 4f1ba2f..301a143 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4145,6 +4145,10 @@ int monitor_read_block_device_key(Monitor *mon, const char *device,
         monitor_printf(mon, "Device not found %s\n", device);
         return -1;
     }
+    if (!blk_bs(blk)) {
+        monitor_printf(mon, "Device '%s' has no medium\n", device);
+        return -1;
+    }
 
     bdrv_add_key(blk_bs(blk), NULL, &err);
     if (err) {