Index: src/desktops.c
===================================================================
--- src/desktops.c	(revision 40841)
+++ src/desktops.c	(working copy)
@@ -1721,7 +1721,8 @@
 {
    Desk               *dsk;
 
-   dsk = _DeskGet(desk);
+   if (!(dsk = DeskGet(desk)))
+       return;
 
    desks.drag_x0 = Mode.events.cx - EoGetX(dsk);
    desks.drag_y0 = Mode.events.cy - EoGetY(dsk);