If a person calls upon the Prophet (peace and blessings be upon him) while not at his grave, is that considered shirk (associating partners with Allah), and is there a difference if he is at the grave?

The questioner:
He says: Honorable Shaykh, may Allah grant you success, if a person calls upon the Prophet (peace and blessings be upon him) while not at his grave, is this act shirk (associating partners with Allah)?

The Shaykh:
What?

The questioner:
If a person calls upon the Prophet (peace and blessings be upon him) while not at his grave, is this act shirk (associating partners with Allah)? And if he is at the grave, does the ruling change?

The Shaykh:
No, the ruling never changes. Calling upon other than Allah is shirk (associating partners with Allah) in any place, whether at the graves or elsewhere. Therefore, sincerity in supplication is required in any place, and this is not specific to the graves. Yes.