--- a/GDBDebugger.st	Tue Jan 25 15:31:28 2022 +0000
+++ b/GDBDebugger.st	Wed Jan 26 16:06:07 2022 +0000
@@ -3,7 +3,7 @@
 "
 jv:libgdbs - GNU Debugger Interface Library
 Copyright (C) 2015-now Jan Vrany
-Copyright (C) 2021 LabWare
+Copyright (C) 2021-2022 LabWare
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
@@ -40,7 +40,7 @@
 "
 jv:libgdbs - GNU Debugger Interface Library
 Copyright (C) 2015-now Jan Vrany
-Copyright (C) 2021 LabWare
+Copyright (C) 2021-2022 LabWare
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
@@ -309,7 +309,7 @@
         self changed: #selectedFrame with: selectedFrame
     ] ifFalse: [ 
         selectedFrame ~= frame ifTrue: [
-            (selectedFrame isSameAs: frame) ifTrue: [
+            (selectedFrame notNil and:[selectedFrame isSameAs: frame]) ifTrue: [
                 selectedFrame invalidate.
                 selectedFrame setAddr: frame addr.
                 selectedFrame setLine: frame line.
@@ -321,7 +321,7 @@
     ].
 
     "Created: / 09-03-2021 / 14:54:42 / Jan Vrany <jan.vrany@labware.com>"
-    "Modified: / 10-03-2021 / 19:12:57 / Jan Vrany <jan.vrany@labware.com>"
+    "Modified: / 24-01-2022 / 15:59:26 / Jan Vrany <jan.vrany@labware.com>"
 ! !
 
 !GDBDebugger methodsFor:'accessing-properties'!