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title: APIkit 4.0.1 Release Notes
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# APIkit 4.0.1 Release Notes

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

**March 20, 2018**

This release fixes an important issue related to the handling of Mule runtime exceptions by the
APIkit router.

The following behavior was fixed: the execution of the flow in the router might result in a
MuleException, a MuleRuntimeException, or an Exception. APIkit was only handling the first one by
rethrowing it. The others were wrapped in a DefaultMuleException, which is mapped to an UNKNOWN
error.

## Compatibility

- Mule Runtime 4.0.0+

- Anypoint Studio 7.0.2

## Fixed in this Release

- APIkit Router incorrectly wraps MuleRuntimeException. (APIKIT-1129)

## See Also

- [Known Issues](https://help.salesforce.com/s/issues)