Index: xcompmgr/xcompmgr.c
===================================================================
RCS file: /cvs/xapps/xcompmgr/xcompmgr.c,v
retrieving revision 1.26
diff -u -r1.26 xcompmgr.c
--- xcompmgr/xcompmgr.c	14 Aug 2004 21:39:51 -0000	1.26
+++ xcompmgr/xcompmgr.c	4 Sep 2004 19:23:19 -0000
@@ -1125,10 +1125,10 @@
     unsigned long n, left;
 
     char *data;
-    XGetWindowProperty(dpy, w->id, opacityAtom, 0L, 1L, False, 
-		       XA_CARDINAL, &actual, &format, 
-		       &n, &left, (unsigned char **) &data);
-    if (data != None)
+    int result = XGetWindowProperty(dpy, w->id, opacityAtom, 0L, 1L, False, 
+				    XA_CARDINAL, &actual, &format, 
+				    &n, &left, (unsigned char **) &data);
+    if (result == Success && data != None)
     {
 	unsigned int i;
 	memcpy (&i, data, sizeof (unsigned int));