Added numbers game.

src/games/letters.js

@@ -66,6 +66,11 @@ function playWord(rawWord, context) {
 function stop(context, aborted) {
 	const game = games.get(context.room.id);
 
+	if (!game) {
+		context.sendMessage(`There is no letters game going on, ${context.user.prefixedUsername}. You can start one with ${config.prefix}letters!`, context.room.id);
+		return;
+	}
+
 	game.ac.abort();
 	games.delete(context.room.id);
 
@@ -124,7 +129,7 @@ function pickLetters(type, context) {
 
 function start(context, letters) {
 	if (games.has(context.room.id)) {
-		context.sendMessage(`${getBoard(context)} This is the current board. Use ${config.prefix}letters:stop to reset.`, context.room.id);
+		context.sendMessage(`${getBoard(context)} is the current board. Use ${config.prefix}letters:stop to reset.`, context.room.id);
 		return;
 	}