no, I think I was right. The condition you described happened, that caused the json function to return null. The fix is to check for null.
Yes, you are 100% right. The read is ok, the assigning goes wrong because of the NULL value.
Credits to you Bruce 
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This is probably an important warning to heed. I say this because I have fallen victim to this issue before in my plugin/module. Anyone who overrides dataFromJson() is vulnerable to this unless they check for null on each data object.
Yeah, Bruce gets credit. I was just the cheerleader
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Here’s your patch recovered without the RPJVisualizer. Now it should load.
DARK-Ambient-recovered.vcv (11.0 KB)
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Appreciate the gesture but I did get it worked out
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I seem to have a similar situation. I had a really fun session and the next day, it wont open. Same if I open in Ableton. It makes it crash right away. Should I contact support or can I show you my crash log?
Did you use the RPJVisualizer in your patch ? In that case re(moving) the folder (to your desktop) and try again.
No, I don’t use that one…
It’s most likely to be a third party plugin, rather than rack itself. It might be very clear in the crash log what is going on.
Thank you Squniky labs 
I ended up deleting everything and re-installing. Works again ok but just super weird.
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probably a random crash that will come back. but maybe you will get lucky.