Average with If condition

I want to calculate the average of the cells in column E, only for the rows that have 0 in column I. It needs an if condition and then perform the standard average line of code.. I am providing the code I have written to calculate the average for all cells in column E. This code needs editing to include this if condtion. If someone knows what to add to have this if condition I would appreciate it !

Also, I am providing a screenshot

lastrow = Cells(Rows.Count, "D").End(xlUp).Row
Range("C1").Formula = "=AVERAGE(E2:E" & lastrow & ")"