Error when importing empty cell array

Hi,

See first answer below, I have provided a minimal working example now. The problem is with a cell array of any size containing uninitialised values.

On Julia 1.0.2 and MATLAB.jl v"0.7.0", with a 4x4 cell array MATLAB variable containing 1200001 x 1 double (4 of them, on the first row) and [] (on the other rows),

I run

file = read_matfile(filepath)
my_variable_MxArray = file[variable_name]
my_variable_julia = jvalue(my_variable_MxArray)

and get the error

ERROR: NULL pointer for MxArray.

with the stacktrace

Stacktrace:
 [1] Type at /Users/maxandrejacqueline/.julia/packages/MATLAB/ZuG4g/src/mxarray.jl:8 [inlined]
 [2] get_cell at /Users/maxandrejacqueline/.julia/packages/MATLAB/ZuG4g/src/mxarray.jl:359 [inlined]
 [3] _jarrayx(::String, ::MATLAB.MxArray, ::Tuple{Int64,Int64}) at /Users/maxandrejacqueline/.julia/packages/MATLAB/ZuG4g/src/mxarray.jl:506
 [4] jmatrix(::MATLAB.MxArray) at /Users/maxandrejacqueline/.julia/packages/MATLAB/ZuG4g/src/mxarray.jl:521
 [5] jvalue(::MATLAB.MxArray) at /Users/maxandrejacqueline/.julia/packages/MATLAB/ZuG4g/src/mxarray.jl:605

I do not have time to provide a minimal working example (MWE) at the moment. I have provided an MWE now.

Best,
Max

Start with the minimal working example in the issue and trace the stacktrace through src/mxarray.jl, especially get_cell, _jarrayx, jmatrix, and jvalue around the referenced lines. Reproduce the import of a cell array containing uninitialised values, then inspect how those cells are converted. Done means the example no longer raises the NULL pointer error and existing conversion behavior remains intact.