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Jsongather crash

The following code will cause CS to crash

u: (crash)
$tmp = ^jsonparse("{}")
jsongather(@10 $$tmp

The crash is in jsonGather() because a member of the FACT struct is accessed without checking to see that the FACT actually exists.

In my code base I’ve just extended the line

if (!|| !(F->flags JSON_FLAGS)) return; // not a json fact 



  [ # 1 ]

fixed for next release - I did that + allowed a 0 length factset on return.


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