From 2311a0ac0efa3da8306f2aa776a9dbc3e3134062 Mon Sep 17 00:00:00 2001
From: Stefan Sauer <ensonic@users.sf.net>
Date: Fri, 16 Mar 2012 12:04:11 +0100
Subject: [PATCH] facedetect: skip detection for unavailable detectors

---
 ext/opencv/gstfacedetect.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/opencv/gstfacedetect.c b/ext/opencv/gstfacedetect.c
index 6883e2c648..a52158b231 100644
--- a/ext/opencv/gstfacedetect.c
+++ b/ext/opencv/gstfacedetect.c
@@ -474,6 +474,9 @@ gst_face_detect_run_detector (GstFaceDetect * filter,
     CvHaarClassifierCascade * detector, gint min_size_width,
     gint min_size_height)
 {
+  if (!detector)
+    return NULL;
+
   return cvHaarDetectObjects (filter->cvGray, detector,
       filter->cvStorage, filter->scale_factor, filter->min_neighbors,
       filter->flags, cvSize (min_size_width, min_size_height)