diff --git a/herbstluftwm/usr/bin/hlwm-run-or-raise b/herbstluftwm/usr/bin/hlwm-run-or-raise
index a06da24..de2dbe1 100755
--- a/herbstluftwm/usr/bin/hlwm-run-or-raise
+++ b/herbstluftwm/usr/bin/hlwm-run-or-raise
@@ -14,7 +14,7 @@
                  (submatch "0x" (+ hex-digit))
                  "\n"))
          (match (regexp-search re output)))
-    (match:substring match 1)))
+    (and match (match:substring match 1))))
 
 (define (pull-element-to-front elt collection)
   (if (string= (car collection) elt)