--- a/DebugView.st	Fri Jan 24 23:50:13 1997 +0100
+++ b/DebugView.st	Sat Jan 25 00:25:24 1997 +0100
@@ -346,6 +346,7 @@
 
     |c found offset sel prev ex|
 
+    aContext isNil ifTrue:[^ 1].
     aContext isBlockContext ifTrue:[^ 1].
     VerboseBacktraceDefault == true ifTrue:[^ 1].
 
@@ -3307,5 +3308,5 @@
 !DebugView class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libtool/DebugView.st,v 1.134 1997-01-15 17:55:07 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libtool/DebugView.st,v 1.135 1997-01-24 23:25:24 cg Exp $'
 ! !