diff --git a/main.cpp b/main.cpp
index b83de60..d297502 100644
--- a/main.cpp
+++ b/main.cpp
@@ -446,6 +446,14 @@ int main()
 		return 1;
 	}
 
+	if (smartList.size() == 0)
+	{
+		endwin();
+		std::cerr << "No S.M.A.R.T readable devices." << std::endl;
+		std::cerr << "If you are non-root user, please use sudo or become root." << std::endl;
+		return 1;
+	}
+
 	WINDOW * windowVersion;
 	windowVersion = newwin(1, width, 0, 0);