LBR Empty records

LBR Empty records

I'm using LBR to trace a program, each time before i'm starting to trace I overwrite the MSR_LASTBRANCH_(N-1)_FROM_IP/TO values with value 0 and execute a few instructions and read out the values. sometimes I'm getting empty records (or skipped record) with values of zero, why would this ever happen?
 

 

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