From a9a5e52a23420d90e5010d7bb8618a04957cb2c3 Mon Sep 17 00:00:00 2001
From: jyelon <jyelon@gmail.com>
Date: Thu, 18 Dec 2025 15:08:55 -0500
Subject: [PATCH] Fix a crash if you don't specify 'lpxserver'

---
 luprex/cpp/drv/driver.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/luprex/cpp/drv/driver.cpp b/luprex/cpp/drv/driver.cpp
index 9da61e68..9558a587 100644
--- a/luprex/cpp/drv/driver.cpp
+++ b/luprex/cpp/drv/driver.cpp
@@ -632,6 +632,12 @@ class Driver {
             }
         }
 
+        // Make sure there's exactly one argument left for the engine type.
+        if (argc != 1) {
+            std::cerr << "Must specify the engine type" << std::endl;
+            return 1;
+        }
+
         // Initialize state variables.
         read_console_recently_ = false;
         chbuf_.reset(new char[DRV_SHORTSTRING_SIZE]);