<p>Hi, this issue might be related to <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="522465581" data-permission-text="Issue title is private" data-url="https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/444" data-hovercard-type="issue" data-hovercard-url="/OpenSmalltalk/opensmalltalk-vm/issues/444/hovercard" href="https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/444">#444</a> as I also the same stack trace for very similar script:</p>
<div class="highlight highlight-source-smalltalk"><pre>| <span class="pl-c1">aJson</span> <span class="pl-c1">anArray</span> |
aJson <span class="pl-k">:=</span> <span class="pl-c1">ZnEasy</span> <span class="pl-c1">get:</span> <span class="pl-s"><span class="pl-pds">'</span>https://data.nasa.gov/resource/y77d-th95.json<span class="pl-pds">'</span></span> asZnUrl.
<span class="pl-c1">Array</span> <span class="pl-c1">streamContents:</span> [ <span class="pl-en">:aStream</span> |
        <span class="pl-c1">4000</span> <span class="pl-c1">timesRepeat:</span> [ 
                aStream <span class="pl-c1">nextPutAll:</span> (<span class="pl-c1">STON</span> <span class="pl-c1">fromString:</span> aJson contents).
                <span class="pl-k">Smalltalk</span> saveSession ] ].
anArray inspect.</pre></div>
<p><a href="https://github.com/OpenSmalltalk/opensmalltalk-vm/files/3843452/crash.dmp.txt">crash.dmp.txt</a></p>

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