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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Win] Null pointer crash."
href="https://bugs.webkit.org/show_bug.cgi?id=149957">149957</a>
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<th>Summary</th>
<td>[Win] Null pointer crash.
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>Product</th>
<td>WebKit
</td>
</tr>
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<th>Version</th>
<td>WebKit Nightly Build
</td>
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
</tr>
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<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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</tr>
<tr>
<th>Reporter</th>
<td>peavo@outlook.com
</td>
</tr></table>
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<pre>I just got a null pointer crash in JSC::speculationFromCell(). The JSCell object looks more or less ok, but the m_structureID member is 0, causing the null pointer crash.
JavaScriptCore.dll!JSC::speculationFromCell(JSC::JSCell * cell) Line 363 + 0x20 bytes C++
JavaScriptCore.dll!JSC::speculationFromValue(JSC::JSValue value) Line 391 + 0x8 bytes C++
JavaScriptCore.dll!JSC::ValueProfileBase<1>::computeUpdatedPrediction(const JSC::ConcurrentJITLocker & __formal) Line 145 + 0x7 bytes C++
JavaScriptCore.dll!JSC::CodeBlock::updateAllPredictionsAndCountLiveness(unsigned int & numberOfLiveNonArgumentValueProfiles, unsigned int & numberOfSamplesInProfiles) Line 3770 C++
JavaScriptCore.dll!JSC::CodeBlock::updateAllPredictions() Line 3815 C++
JavaScriptCore.dll!operationOptimize(JSC::ExecState * exec, int bytecodeIndex) Line 1142 C++</pre>
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