How to process out of bound words?

Thans for the job.
    I am not English native,  I found that some out of bound word will give no correct IPA output, but the word with a star. eg:

e2ipa.convert("Strathclyde Police declined to comment")  output is ：

Stranthclyde* pə¹lis dɪklaɪnd ...

    I am not English speaker, and  I do not know how to process this kind of exception.