Index: xcompmgr.c
===================================================================
RCS file: /cvs/xapps/xcompmgr/xcompmgr.c,v
retrieving revision 1.26
diff -u -3 -p -r1.26 xcompmgr.c
--- xcompmgr.c	14 Aug 2004 21:39:51 -0000	1.26
+++ xcompmgr.c	22 Aug 2004 00:58:24 -0000
@@ -1124,11 +1124,11 @@ get_opacity_prop(Display *dpy, win *w, u
     int format;
     unsigned long n, left;
 
-    char *data;
-    XGetWindowProperty(dpy, w->id, opacityAtom, 0L, 1L, False, 
+    char *data = NULL;
+    if (XGetWindowProperty(dpy, w->id, opacityAtom, 0L, 1L, False, 
 		       XA_CARDINAL, &actual, &format, 
-		       &n, &left, (unsigned char **) &data);
-    if (data != None)
+		       &n, &left, (unsigned char **) &data) == Success
+            && data != NULL)
     {
 	unsigned int i;
 	memcpy (&i, data, sizeof (unsigned int));