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#725277
diff --git a/src/window.c b/src/window.c
index 74ab775..97e91e7 100644
--- a/src/window.c
+++ b/src/window.c
@@ -3077,6 +3077,7 @@ findLowestSiblingBelow (CompWindow *w)
switch (type) {
case CompWindowTypeDesktopMask:
/* desktop window layer */
+ return NULL;
break;
case CompWindowTypeFullscreenMask:
case CompWindowTypeDockMask: