Invoice under gst

Helllo all,

I have a query regarding issue of invoice under GST.

I have raised invoice series in continuous order for taxable supplies for a party. But mistakenly one number in continuous order is missed. What should i do now while filling GST returns?? Let me clarify that missed number is not issued to any party or to anyone. It is completely missed and i have moved ahead in issuing the invoice further in continuation.

Kindly help