"What's My Line?" - Number of episodes

The "What's My Line?" title page states there are 877 episodes. However, the episode list shows only 876: - one season (1) with 15 episodes; - one season (18) with 48 episodes; - two seasons (10, 11) with 49 episodes; - seven seasons (2, 12-17) with 50 episodes; - one season (6) with 51 episodes; - four seasons (4, 5, 7, 8) with 52 episodes; and - two seasons (3, 9) with 53 episodes. So where's the 877th episode?