Help with obtaining crash report.

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So I've never seen this before, and i did some research, and found nothing similar to this anywhere, before i decided to ask, but whenever i go to collect a crash report file, the file is always in a .zip and when i go to unzip it is says that the file is corrupted and to try again. Do you have any idea what i can do to fix this? I'm all up for suggestions! (Also, I've uninstalled and reinstalled many times and that did nothing.)

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I can send a screenshot of it, but it is most definitely a .zip, when i unzip it the file inside is a .json which has been corrupted.

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I get it from the modpacks\(modpackname)\crashreports and every crash report is a .zip.

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I was told to ask here by the modpacks owner because he has never heard/seen anything like this, so he assumed that it was a FML error of some sort.

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Also mentioning this, the file is a .log.zip, the first time i attempt to unzip it says "unexpected end of archive" the second time it says that the file has been corrupted.

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Is there anywhere you would recommend me to ask around?