Segment fault with Aquila::OouraFft::ifft()

fft.cpp

#include <iostream>                                                                                                                                                                
#include <aquila/global.h>
#include <aquila/source/WaveFile.h>
#include <aquila/tools/TextPlot.h>
#include <aquila/transform/FftFactory.h>
#include <algorithm>
#include <cstdlib>

int main(int argc, const char *argv[])
{
    if(argc < 2) {
        std::cout<<"Filename not found."<<std::endl;
        return -1; 
    }   

    Aquila::WaveFile wav(argv[1]);
    std::cout<<"Loaded file "<<wav.getFilename()
        <<" ("<<wav.getBitsPerSample()<<"b)"<<std::endl
        <<" samples: "<<wav.getSamplesCount()<<std::endl
        <<" sample frequency: "<<wav.getSampleFrequency()<<std::endl;
    
    std::size_t SIZE = 44100; // It's ok when size is 64.
    Aquila::TextPlot plt("Signal waveform before filteration");
    plt.plot(wav.toArray(), SIZE);

    auto fft = Aquila::FftFactory::getFft(SIZE);
    Aquila::SpectrumType spectrum = fft->fft(wav.toArray());
    plt.setTitle("Signal spectrum before filteration");
    plt.plotSpectrum(spectrum);
    
    double x1[SIZE];
    fft->ifft(spectrum, x1);
    
    plt.setTitle("Signal waveform after filteration");
    plt.plot(x1, SIZE);

    return 0;
}