Merge branch 'master' into jgrpp

# Conflicts:
#	.github/workflows/ci-build.yml
#	.github/workflows/release.yml
#	CMakeLists.txt
#	os/macosx/Info.plist.in
#	src/fileio.cpp
#	src/landscape.cpp
#	src/league_cmd.h
#	src/saveload/ai_sl.cpp
#	src/saveload/game_sl.cpp
#	src/saveload/league_sl.cpp
#	src/saveload/saveload.cpp

src/ai/ai_scanner.cpp

@@ -10,6 +10,7 @@
 #include "../stdafx.h"
 #include "../debug.h"
 #include "../network/network.h"
+#include "../openttd.h"
 #include "../core/random_func.hpp"
 
 #include "../script/squirrel_class.hpp"
@@ -59,6 +60,11 @@ void AIScannerInfo::RegisterAPI(class Squirrel *engine)
 
 AIInfo *AIScannerInfo::SelectRandomAI() const
 {
+	if (_game_mode == GM_MENU) {
+		DEBUG(script, 0, "The intro game should not use AI, loading 'dummy' AI.");
+		return this->info_dummy;
+	}
+
 	uint num_random_ais = 0;
 	for (const auto &item : info_single_list) {
 		AIInfo *i = static_cast<AIInfo *>(item.second);