D18751.id45007.diff
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	diff --git a/src/markup/engine/__tests__/remarkup/table-with-long-header.txt b/src/markup/engine/__tests__/remarkup/table-with-long-header.txt
	new file mode 100644
	--- /dev/null
	+++ b/src/markup/engine/__tests__/remarkup/table-with-long-header.txt
	@@ -0,0 +1,8 @@
	+\|x\|
	+\|\|--
	+~~~~~~~~~~
	+<div class="remarkup-table-wrap"><table class="remarkup-table">
	+<tr><td>x</td></tr>
	+</table></div>
	+~~~~~~~~~~
	+\| x \|
	diff --git a/src/markup/engine/remarkup/blockrule/PhutilRemarkupSimpleTableBlockRule.php b/src/markup/engine/remarkup/blockrule/PhutilRemarkupSimpleTableBlockRule.php
	--- a/src/markup/engine/remarkup/blockrule/PhutilRemarkupSimpleTableBlockRule.php
	+++ b/src/markup/engine/remarkup/blockrule/PhutilRemarkupSimpleTableBlockRule.php
	@@ -73,7 +73,14 @@
	// Mark previous row with headings.
	foreach ($cells as $i => $cell) {
	if ($cell['content']) {
	- $rows[last_key($rows)]['content'][$i]['type'] = 'th';
	+ $last_key = last_key($rows);
	+ if (!isset($rows[$last_key]['content'][$i])) {
	+ // If this row has more cells than the previous row, there may
	+ // not be a cell above this one to turn into a <th />.
	+ continue;
	+ }
	+
	+ $rows[$last_key]['content'][$i]['type'] = 'th';
	}
	}
	}