From 47ed86dda4a2191a8b648679b641e6cedc6c931e Mon Sep 17 00:00:00 2001
From: Mark Schreiber <mark7@alumni.cmu.edu>
Date: Fri, 14 Jun 2019 19:08:40 -0700
Subject: [PATCH] Fix UPS guns for multiple ammotype support

Recent support for multiple ammotypes broke UPS guns, as they have no
ammotype.  Fix.
---
 src/veh_type.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/veh_type.cpp b/src/veh_type.cpp
index 29bdd288891c2..ab6d37e845e4b 100644
--- a/src/veh_type.cpp
+++ b/src/veh_type.cpp
@@ -1061,7 +1061,9 @@ void vehicle_prototype::finalize()
                     }
                 }
                 if( pt.ammo_types.empty() ) {
-                    pt.ammo_types.insert( ammotype( *base->gun->ammo.begin() )->default_ammotype() );
+                    if (!base->gun->ammo.empty()) {
+                        pt.ammo_types.insert( ammotype( *base->gun->ammo.begin() )->default_ammotype() );
+                    }
                 }
             }