Single data point causes BAB function to return error

[spetersongit]

Hello,

I'm doing a class project for undergrads where they collect morphological data on plants and use phangorn to create phylogenetic trees from their matrix of data. I decided for ease of data collection to have all categories be binary traits. Sometimes, there is a single cell of data which throws an error when using the bab() function:

Error in *tmp*[[i]] : subscript out of bounds

If I change that single cell from a 1 to a 0, the program can make trees.

An example dataset that throws the error is attached here
MorphData.csv
. The error is linked to cells 8, 14 or 9, 14 (Linear_S variable, Species 7 & 8). If I change either 1 in that column to a 0, this set of traits will work. Otherwise it fails.

The code I am using is:
morph_data = read.csv(MorphData.csv, row.names = 1)

#Reformat the data to be useful for tree analysis
morph_data = phyDat(as.matrix(morph_data), type = "USER", levels = 0:1)

#Create a set of candidate trees using the Branch and Bound algorithm
morph_cand = bab(morph_data, trace = 0)

The error occurs in the bab() line.

Any help tracking down what might be happening would be huge.