Elastic APM PHP agent causes segmentation fault when handling errors

[intuibase]

Describe the bug
Agent crashes application when handling errors.

To Reproduce
call following script:

<?php

$filename = __DIR__."/highlight_file.dat";

var_dump(highlight_file($filename));

var_dump(highlight_file('data:,<?php echo "test"; ?>'));

var_dump(highlight_file('data:,<?php echo "test ?>'));

$data = '
<?php
class test {
    public $var = 1;
    private function foo() { echo "foo"; }
    public function bar() { var_dump(test::foo()); }
}
?>';

file_put_contents($filename, $data);
var_dump(highlight_file($filename));


@unlink($filename);
echo "Done\n";
?>

Expected behavior
Run without crash