diff --git a/game/src/game/mod.rs b/game/src/game/mod.rs
index 0011a13..661628a 100644
--- a/game/src/game/mod.rs
+++ b/game/src/game/mod.rs
@@ -96,7 +96,9 @@ impl Game {
                     let hex = Hex::from_tile(play.from);
                     let offset = (piece.player as i8 * 2) - 1;
                     if !piece.promoted && !Hex::is_valid(hex.x() as i8, hex.y() as i8 + offset) {
-                        piece.promoted = true;
+                        if let Some(piece) = &mut self.board.pieces[pid as usize] {
+                            piece.promoted = true;
+                        }
                     }
                     true
                 } else { false }