It is generally not recommended to freeze the ceramic liner of a crock pot or slow cooker. Ceramic can be sensitive to extreme temperature changes, and freezing it could potentially cause cracking or other damage to the liner.
The ceramic liner of a crock pot is designed to handle low and slow cooking temperatures, typically up to around 300°F (150°C). Freezing temperatures, on the other hand, can drop well below 0°F (-18°C), which is a significant difference that could lead to thermal shock and breakage.
If you need to freeze food or ingredients, it's better to transfer them to a suitable freezer-safe container, like a plastic or glass container, before placing them in the freezer. When you're ready to use the frozen food, you can thaw it in the refrigerator and then transfer it to your crock pot for cooking.
To keep your ceramic liner in good condition, always follow the manufacturer's care and usage instructions. Avoid subjecting it to rapid temperature changes and extreme conditions to prolong its lifespan and prevent any potential damage.