Concern about Signal to Noise Ratio (SNR) in ABIDE Data

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Hi all, I am using CPAC default pipeline to pre-process ABIDE data. Should I be concerned about SNR values of 0? I have run four subjects and essentially all of my SNR heat maps look like this:

sub-KKI_ses-1_task-rest_reg-default_desc-boldSnrSagittal_quality
sub-KKI_ses-1_task-rest_reg-default_desc-boldSnrSagittal_quality1101×607 136 KB

Any guidance would be greatly appreciated.