Undo is stopped only
@@ -1924,6 +1924,8 @@ static bool wave(GB_gameboy_t *gb, char *arguments, char *modifiers, const debug
static bool undo(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
+ STOPPED_ONLY
+
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
