unique function in uitable matlab

I have program to display data in a uitable:

data_plat = load('Data_Plat.mat');
Database_All = data_plat.Database_All;
data2 = table2cell(Database_All(strcmpi(Database_All.Plat, final_output), ...
    {'Plat', 'Nama', 'Jurusan', 'Status'}));
data2 = [get(handles.uitable1, 'Data'); data2];
[~,idx]=unique(cell2mat(data2),'rows');
unique_data2 =  data2(idx,:);
set(handles.uitable1, 'Data', unique_data2);

final_output is a number computed by the program which always changes because the program is processing video.

when its starting, its doing normally, but when second data in(final_output), it get error message :

Error using cat Dimensions of matrices being concatenated are not consistent.   
Error in cell2mat (line 78) m = cat(1,m{:});
Error in mpengujianbmpengujianbplay_Callback (line 222) T=cell2mat(data2);

when i run this code without unique funtion, its doing fine(no error message) but always replicate in table so i appending unique funtion to solve that, the question is what must i do, something wrong with my code(unique function) or add another function to solve my problem(replicate data in table)?