--- a/DeviceWorkstation.st	Wed Aug 19 16:21:21 1998 +0200
+++ b/DeviceWorkstation.st	Wed Aug 19 18:43:18 1998 +0200
@@ -5733,6 +5733,10 @@
 	]
     ].
 
+    knownIds isNil ifTrue:[
+	^ nil
+    ].
+
     index := knownIds indexOf:aWindowID.
     index == 0 ifTrue:[
 	^ nil
@@ -6077,6 +6081,6 @@
 !DeviceWorkstation class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libview/DeviceWorkstation.st,v 1.263 1998-08-18 13:14:42 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libview/DeviceWorkstation.st,v 1.264 1998-08-19 16:43:18 cg Exp $'
 ! !
 DeviceWorkstation initialize!