Execution never terminates

[VolodymyrBiryuk]

After I execute this command everything works fine, the output is generated but the execution never terminates, gets stuck at generating chart and I have to kill it manually:

pi@raspberrypi:~/RPiSpectrometer-master $ python3 spectrometer.py ./results/test 30000
initialising camera
allowing camera to warmup
capturing image
locating aperture
analysing image
ideal exposure between 0.15 and 0.30
exposure= 1.3442304921653898
consider reducing shutter time
exporting CSV
generating chart

[hiramvillarreal]

It seems there is an issue with long exposures on the latest raspbian, I found a workaround by setting the framerate back up to 1 before calling camera.close()
camera.framerate = 1

[handyfreak]

Great! It worked for me.