lmerge divide zero error

[genostack]

we have 1000 samples and when lmerge after lsort, lmerge:213 report divide zero error.
some debug info:

combine_pdfs(BP, c ,use_product, weighting_scheme)

a_L[0] p_L[0] on lmerge：128

miss=1 on lmerge:181

I doubt it may be caused by the "unweighted" scheme? and all the BP has no internals?

[genostack]

another question about lmerge:213
sum_L = sum(p_L)
sum_R = sum(p_R) not used
p_L = [x/sum_L for x in p_L]
p_R = [x/sum_L for x in p_R] sum_L used twice
on this line sum_R is not used and sum_L is used both on R and L ,is this what we wanted?

[genostack]

after some debugging I found we have a BP cause this issue:

I need some time to find why this BP has a zero p value