Fix segfault when running under Xvfb

1 files changed, 8 insertions, 6 deletions

diff --git a/scripts/list-outputs.c b/scripts/list-outputs.c
index f2c3f0b..183258c 100644
--- a/scripts/list-outputs.c
+++ b/scripts/list-outputs.c
@@ -12,14 +12,16 @@ int main(int argc, char **argv)
 
     rr = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
 
-    for (i = 0; i < rr->noutput; i++) {
-	    output = XRRGetOutputInfo(dpy, rr, rr->outputs[i]);
+    if (rr != NULL) {
+        for (i = 0; i < rr->noutput; i++) {
+            output = XRRGetOutputInfo(dpy, rr, rr->outputs[i]);
 
-        if (output->connection == RR_Connected) {
-            printf("%s\n", output->name);
-        }
+            if (output->connection == RR_Connected) {
+                printf("%s\n", output->name);
+            }
 
-        XRRFreeOutputInfo(output);
+            XRRFreeOutputInfo(output);
+        }
     }
 
     XRRFreeScreenResources(rr);