--- poppler-git-3sep12/poppler/JBIG2Stream.cc-	2012-09-03 01:10:00.441035919 +0200
+++ poppler-git-3sep12/poppler/JBIG2Stream.cc	2012-09-04 02:00:59.386494022 +0200
@@ -722,6 +722,13 @@
 JBIG2Bitmap::JBIG2Bitmap(Guint segNumA, JBIG2Bitmap *bitmap):
   JBIG2Segment(segNumA)
 {
+  if (!bitmap) {
+    error(errSyntaxError, -1, "NULL bitmap in JBIG2Bitmap");
+    w = h = line = 0;
+    data = NULL;
+    return;
+  }
+
   w = bitmap->w;
   h = bitmap->h;
   line = bitmap->line;