Fix bug introduced into alpha_filter by previous bugfix.
Fix bug introduced into alpha_filter by previous bugfix.

saq7/MeTA,husseinhazimeh/meta,saq7/MeTA,gef756/meta,husseinhazimeh/meta,husseinhazimeh/meta,esparza83/meta,gef756/meta,esparza83/meta,esparza83/meta,gef756/meta,gef756/meta,esparza83/meta,husseinhazimeh/meta,saq7/MeTA,esparza83/meta,husseinhazimeh/meta,gef756/meta