Apigee extracting error variables

Hello. 

I have a Service Callout policy with "continueOnError" set to true, however, when encountering an error with a null response, such as "Error writing request to target", I am unable to access the "error.cause" variable. Is there a way to extract this variable in situations where "continueOnError" is true, or to find the cause of the error, or is it not possible to determine the cause of the error under these conditions?

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