From a702fd7b27e8ab3b652725d071744427f3fc2d3e Mon Sep 17 00:00:00 2001
From: James Turner <james@flightgear.org>
Date: Mon, 24 May 2021 15:54:17 +0100
Subject: [PATCH] Controls: ensure engine index is valid
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Some spacecraft send out-of-range engine numbers from the JSBsim side.
Should probably be fixed in JSBsim itself but let’s check here to
keep compat with existing FDMs.
---
 src/Aircraft/controls.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Aircraft/controls.cxx b/src/Aircraft/controls.cxx
index d22f81b6b..d2b197c18 100644
--- a/src/Aircraft/controls.cxx
+++ b/src/Aircraft/controls.cxx
@@ -1831,7 +1831,7 @@ void FGControls::fireEngineValueChanged(int index, simgear::PropertyList& props)
         std::for_each(props.begin(), props.end(), [](const SGPropertyNode_ptr &p) {
             p->fireValueChanged();
         });
-    } else {
+    } else if ((index >= 0) && (index < MAX_ENGINES)) {
         props.at(index)->fireValueChanged();
     }
 }