gitbook/ungrouped-pages/FAQs.md
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description: Frequently asked questions
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# FAQs
**Why are all the handler not called in subscription handlers ?**
* Please check the handler right before this handler \(where data is `undefined`\) if you're returning any data or not, if not then please return whatever needs to be passed to the next handler.
* If this is the first handler in the pipeline, then check your middleware if it's returning any data or not.