> For the complete documentation index, see [llms.txt](https://docs.abtasty.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.abtasty.com/recommendations-and-merchandising/concepts/strategies/rules/exceptions-and-fallback.md).

# Exceptions & Fallback

Even with well-defined rules, there are always cases where the expected product set cannot be fully generated. To ensure stability and consistency of your strategies, **exceptions** and **fallbacks** are built into the rule engine.

### **Exceptions**

* Allow you to *exclude specific cases* or define special treatments.
* Example: *If the current product belongs to “outlet” category, exclude it from recommendations.*
* Practical use: avoid showing restricted categories, duplicate products, or unwanted items in a given context.

### **Fallbacks**

* Define what happens if a rule does not return enough products (e.g., fewer than the required 12).
* Examples:
  * Fill remaining slots with *global top sellers*.
  * Show a *default curated list*.
  * Hide the block entirely (last-resort option).
* This ensures **no empty space** in your templates and guarantees a **predictable user experience**.

{% hint style="info" %}
Exceptions & fallback rules provide **resilience**. They prevent broken layouts, ensure continuity of engagement, and avoid showing irrelevant or empty recommendations
{% endhint %}


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