Error using containers.Map in matlab 2015a

I have got this error. Here i attached my code:

image = hdrread('Apartment_float_o15C.hdr');

[h,w,~] = size(image);

uint16_image = to_16_bit(image);

keys = unique(uint16_image);
[num_keys, ~] = size(keys); 

values = (0:1:num_keys-1).';

map = containers.Map(keys, values);
inverse_map = containers.Map(values, keys);

%uint16_image_mapped = image2MappedImage(uint16_image, map);
%uint16_image_reversed = image2MappedImage(uint16_image_mapped, inverse_map);

image_mapped = to_single(uint16_image_mapped);

figure
histo = histogram(uint16_image,'BinWidth',1)
figure
mapped_histo = histogram(uint16_image_mapped,'BinWidth',1)
figure
reversed_histo = histogram(uint16_image_reversed,'BinWidth',1)

figure
imshow( tonemap(image_mapped), []);

result = image2MappedImage(uint16_image, map);
result = to_16_bit(image);
result = to_single(image);
result = getBinCounts(histo);

The error is here:

Error in hdr_OpenEXR_format (line 12)
map = containers.Map(keys, values);

can anyone help me out of this? Thanks in advance

[Guillaume]

There should be more to the error message, in particular a description of what the error is.

Is the class of keys uint16? Note that containers.Map does not support 16-bit keys. In my version (R2018a) it is automatically converted to double. Perhaps in R2015a, it just errors.

[Rupok Kumar]

It works in R2018a but not working in my version which is R2015a. The error shoes that:

Error using containers.Map
NaN-valued key is not allowed for this container.

Error in hdr_OpenEXR_format (line 12)
map = containers.Map(keys, values);

What i need to change, could you help me please?

[Guillaume]

What does

any(isnan(keys))

return?