Not really. Part of the symbol integrity checking reports duplicate pin names. This is important for the PCB Editor flow, other flows may allow duplicated pin names.
You can run the Library correction utility over the library to ensure unique pin names, Open a project then from the menu, Accessories>LibCorrectionUtil>Library Verification / Correction, the duplicated pin names will be forced to be unique if the "correct" option is taken.
In reply to oldmouldy: