Hi @fstupot ,
I guess you should use [Get items],
And use the Filter query to filter, and then use [Get attachments] to get the attachment content and send the email.
If [Get items] does not return any results, then [Get attachments] is empty, [Apply to each 2] is executed 0 times, and the flow will execute successfully.
(The above is my guess about your flow design)
I made a similar template for your reference:
Here is form:

Here is sharepoint list





The flow will also be executed successfully, but the email will not be sent, because [Get items ] did not find the record of "Title" eq 2, and it will return an empty one.



Please check whether the value in the output of [Get items] is empty.
If yes,
Please check whether the Filter query can filter out the results you want
The above process can be executed under normal circumstances
Here is result:


Best Regards
Cheng Feng