--- a/heuristics/heuristics.inc.php
+++ b/heuristics/heuristics.inc.php
@@ -8,9 +8,11 @@
 //include ("valueHeuristics.php");
 function runHeuristic($heuristicName, $cn)
 {
+    global $conn;
 	// check  if already ran
-	$query = "select count(*) from heuristic_results where heuristic_name = '$heuristicName' and CNID = '{$cn['CNID']}'";
+	$query = "select count(*) from heuristic_results where heuristic_name = '$heuristicName' and \"CNID\" = '{$cn['CNID']}'";
 	    $result = $conn->query($query);
+             databaseError($conn->errorInfo());
     $r = $result->fetch(PDO::FETCH_BOTH);
 	if ($r[0] == 0) {
 		// if not, run now