diff --git a/npa/src/npa-tool.c b/npa/src/npa-tool.c
index 77025b0..7aca2b4 100644
--- a/npa/src/npa-tool.c
+++ b/npa/src/npa-tool.c
@@ -582,5 +582,8 @@ err:
     sc_disconnect_card(card);
     sc_release_context(ctx);
 
+    if (r < 0)
+        fprintf(stderr, "Error: %s\n", sc_strerror(r));
+
     return -r;
 }