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What are the contents of that file?  Is it legal JSON?  How did you get that file? 

Yes, it was generated by pulumi before. I've just been able to import the stack successfully with the `--force` flag:

```
pulumi stack import --disable-integrity-checking --file ~/Downloads/pulumi_history_experiments_experiments-1574820036002431000.checkpoint.json --force
```

So it seems like a bug with the `pulumi stack import` command? I can open a github issue for this if that would help.

Huh - that is very unexpected. Yes - an issue would be great - especially if it’s something you can reproduce. 

Tried a `pulumi up --refresh` afterwards, and hit an exception actually. I'll add details in a github issue.