Crack in Mortar - How Do I Fix?

I have a crack in the front mortar. I properly did the 6 days of slow firing. This is my second full fire to make pizzas. Can I fix this?

Super Easy (and inexpensive) Fix!

When the oven is warm, simply squeeze some High-Temperature Mortar into the crack.

In about 3 minutes it will be hard… then in 2 hours, it will be rock-hard and resistant to future cracking.

EXTERIOR (Tan / Buff Color)

INTERIOR (Black / Soot Color)