[octave] Issue in 'validvarname' function

[carissableker]

Code:

model = ExpressionsToOdefy({'a = a || b','b = a && b'})

Error:

error: zeros: invalid class name
error: called from
    unique at line 113 column 11
    validvarname at line 25 column 14
    ExpressionsToOdefy at line 46 column 18

Line with the issue:

Odefy/Odefy-1.20/code/models/validvarname.m

Line 25 in c725161

illegalChars = unique(varname(regexp(varname,'[^A-Za-z_0-9]')));

Issue is circumvented by commenting out calls to 'validvarname' in 'ExpressionsToOdefy.m'