Merge branch 'master' into jgrpp

# Conflicts:
#	src/3rdparty/fmt/core.h
#	src/command_type.h
#	src/console_cmds.cpp
#	src/core/overflowsafe_type.hpp
#	src/landscape.cpp
#	src/network/network.cpp
#	src/newgrf_object.h
#	src/object_cmd.cpp
#	src/order_gui.cpp
#	src/saveload/vehicle_sl.cpp
#	src/script/api/script_industrytype.cpp
#	src/script/api/script_object.hpp
#	src/script/api/script_town.cpp
#	src/table/object_land.h
#	src/timetable_cmd.cpp
#	src/tree_cmd.cpp
#	src/vehicle_gui.cpp
#	src/window.cpp

src/saveload/vehicle_sl.cpp

@@ -497,14 +497,16 @@ void AfterLoadVehicles(bool part_of_load)
 					v->GetImage(v->direction, EIT_ON_MAP, &v->sprite_seq);
 					v->UpdateSpriteSeqBound();
 
-					/* The plane's shadow will have the same image as the plane, but no colour */
+					/* The aircraft's shadow will have the same image as the aircraft, but no colour */
 					Vehicle *shadow = v->Next();
+					if (shadow == nullptr) SlErrorCorrupt("Missing shadow for aircraft");
 					shadow->sprite_seq.CopyWithoutPalette(v->sprite_seq);
 					shadow->sprite_seq_bounds = v->sprite_seq_bounds;
 
 					/* In the case of a helicopter we will update the rotor sprites */
 					if (v->subtype == AIR_HELICOPTER) {
 						Vehicle *rotor = shadow->Next();
+						if (rotor == nullptr) SlErrorCorrupt("Missing rotor for helicopter");
 						GetRotorImage(Aircraft::From(v), EIT_ON_MAP, &rotor->sprite_seq);
 						rotor->UpdateSpriteSeqBound();
 					}