diff --git a/openbox/dock.c b/openbox/dock.c
index e78c2991..adf61e84 100644
--- a/openbox/dock.c
+++ b/openbox/dock.c
@@ -651,7 +651,6 @@ void dock_get_area(Rect *a)
 
 ObDockApp* dock_find_dockapp(Window xwin)
 {
-    g_assert(xwin != None);
     GList *it;
     /* there are never that many dock apps, so we can use a list here instead
        of a hash table */
diff --git a/openbox/window.c b/openbox/window.c
index f094602c..e13638e0 100644
--- a/openbox/window.c
+++ b/openbox/window.c
@@ -76,7 +76,6 @@ ObStackingLayer window_layer(ObWindow *self)
 
 ObWindow* window_find(Window xwin)
 {
-    g_assert(xwin != None);
     return g_hash_table_lookup(window_map, &xwin);
 }