Cab notification : error in serverout0.txt

Cab notification : error in serverout0.txt

Hello, 
I have an issue with the cab notification :
here what i have in serverout0.txt 
[10:50:19:762]|[06-01-2018]|[com.adventnet.persistence.interceptor.NotificationPersistenceInterceptor]|[WARNING]|[328]: Empty Notification is being notified. P
lease check it ...|


So, no e-mail what so ever for the cab recommendation. but all other notification seem to work so far.

does anyone have seen this before ?

regards

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