From http://www.jwz.org/xscreensaver/xscreensaver-5.27.tar.gz

[xscreensaver] / OSX / osxgrabscreen.m

diff --git a/OSX/osxgrabscreen.m b/OSX/osxgrabscreen.m
index 8de3a09cae63cd646fcb5d6f324444bc5d6b4c43..29b257acb405bd303e7cdb768bccc6b01f5af31b 100644 (file)
--- a/OSX/osxgrabscreen.m
+++ b/OSX/osxgrabscreen.m
@@ -424,6 +424,8 @@ osx_load_image_file (Screen *screen, Window xwindow, Drawable drawable,
 {
 # ifndef USE_IPHONE
 
+  if (!filename || !*filename) return False;
+
   NSImage *img = [[NSImage alloc] initWithContentsOfFile:
                                     [NSString stringWithCString:filename
                                               encoding:NSUTF8StringEncoding]];