--- picture_viewer.c.orig       2008-01-28 13:51:48.000000000 +0000
+++ picture_viewer.c    2008-01-28 13:55:22.000000000 +0000
@@ -760,6 +760,11 @@
 cb_rstto_picture_viewer_scroll_event (RsttoPictureViewer *viewer, GdkEventScroll *event)
 {
     RsttoNavigatorEntry *entry = rstto_navigator_get_file(viewer->priv->navigator);
+
+    if (entry == NULL) {
+           return;
+    }
+
     gdouble scale = rstto_navigator_entry_get_scale(entry);
     viewer->priv->zoom_mode = RSTTO_ZOOM_MODE_CUSTOM;
     switch(event->direction)