--- a/GDBThreadGroup.st	Sun Feb 04 21:18:15 2018 +0000
+++ b/GDBThreadGroup.st	Sun Feb 04 23:37:35 2018 +0000
@@ -299,6 +299,12 @@
     ^ self isDead and:[ exit_code isNil ]
 
     "Created: / 06-06-2017 / 09:26:31 / Jan Vrany <jan.vrany@fit.cvut.cz>"
+!
+
+isValid
+    ^ debugger isConnected and:[ self isDead not ]
+
+    "Created: / 04-02-2018 / 21:31:49 / Jan Vrany <jan.vrany@fit.cvut.cz>"
 ! !
 
 !GDBThreadGroup class methodsFor:'documentation'!