early return when no legal moves, skipping sort call

1 files changed, 3 insertions, 0 deletions

diff --git a/src/bot.cpp b/src/bot.cpp
index 0f8d12a..a1b4fb2 100644
--- a/src/bot.cpp
+++ b/src/bot.cpp
@@ -119,6 +119,9 @@ int ScoreMove(const Game *board, const Move &move) {
 
 std::vector<Move> GetSortedLegalMoves(Game *g) {
   auto moves = GetLegalMoves(g);
+  if (moves.size() == 0) {
+    return moves;
+  }
   std::sort(moves.begin(), moves.end(), [&](const Move &a, const Move &c) {
     return ScoreMove(g, a) > ScoreMove(g, c);
   });