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This doesn't look like a general issue. Because this part of Inventor API is well tested and used by many users.

Can you provide some minimal dataset where the error occurs?

Try to check what kind of occurrence you have as input. Because this can be some strange type. For example virtual component, weld bead in weldment assembly, iPart/iAssembly instance etc. 

 

BTW please put code sample as text instead of print screen.