WHAT IS THE WRONG TERM IN THE FOLLOWING SERIES?

440,420,399,378,354

440,420,399,378,354
As we see
440-420=20
420-399=21
399-378=21
378-354=24
Therefore 378 disturbs the series and if it is converted to 377
Then
440-420=20
420-399=21
399-377=22
377-354=23
The difference increases with 1 i.e. 20,21,22,23
Hence Wrong term in the series is 378