From a91cc7aad70bc347faa8b103866f22b55847aa07 Mon Sep 17 00:00:00 2001
From: Bill Geyer <bnsgeyer@aol.com>
Date: Sat, 29 Jan 2022 23:06:07 -0500
Subject: [PATCH] AC_AutoTune: fix code response for unknown tune type

---
 libraries/AC_AutoTune/AC_AutoTune.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libraries/AC_AutoTune/AC_AutoTune.cpp b/libraries/AC_AutoTune/AC_AutoTune.cpp
index a737433d23..2bc04519ef 100644
--- a/libraries/AC_AutoTune/AC_AutoTune.cpp
+++ b/libraries/AC_AutoTune/AC_AutoTune.cpp
@@ -173,7 +173,9 @@ const char *AC_AutoTune::type_string() const
     case TUNE_COMPLETE:
         return "Tune Complete";
     }
-    return "Bug";
+    return "unknown tune type";
+    // this should never happen
+    INTERNAL_ERROR(AP_InternalError::error_t::flow_of_control);
 }
 
 // run - runs the autotune flight mode