Description:
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I'm trying to execute a query using the same ODBC connect ID that is customized by previous query in the same code.
If I comment second odbc_fetch_row runs fine. With this one uncommented a Dr.Watson on server appears.

Reproduce code:
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// $connect is the connect ID to the database previously
// generated without problems
$query1="SELECT F11, F12 FROM T1";
$result1=odbc_exec($connect,$query1);
while(odbc_fetch_row($result1)) {
  $query2="SELECT F21, F22 FROM T2";
  $result2=odbc_exec($connect,$query2);
  while(odbc_fetch_row($result2)) { // HERE IS THE ERROR
    do_anything;
  }
}

Actual result:
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In server appears a Dr.Watson error (GPF) and in Apache's error log a line:
Premature end of script headers: c:/php/php.exe