What is the difference between "Ajirna" and "Ajirni"?

I don't know Arabic very well.

Our imam in the mosque says "Allahumma Ajirna Minan Naar" and we say "Ameen" to it.

Now due to lockdown, I hear to radio more often and I noticed that the Imam in the radio says "Allahumma Ajirni Minan Naar "

Is there a difference between the two ?

I asked my teacher but she was also confused.She said that the latter is the correct one according to her knowledge.

Please explain

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