Bert Freudenberg uploaded a new version of Tools to project The Trunk:
http://source.squeak.org/trunk/Tools-bf.700.mcz

==================== Summary ====================

Name: Tools-bf.700
Author: bf
Time: 11 May 2016, 3:28:07.960335 pm
UUID: dc9a06fa-3586-4a29-bafb-578a1c83ac42
Ancestors: Tools-mt.699

Debugger: show stack top only if stack not empty

=============== Diff against Tools-mt.699 ===============

Item was changed:
  ----- Method: ContextVariablesInspector>>selection (in category 'selecting') -----
  selection 
  	"Refer to the comment in Inspector|selection."
  	selectionIndex = 0 ifTrue:[^''].
  	selectionIndex = 1 ifTrue: [^object].
+ 	selectionIndex = 2 ifTrue: [^object stackPtr > object method numTemps ifTrue: [object top]].
- 	selectionIndex = 2 ifTrue: [^object stackPtr > 0 ifTrue: [object top]].
  	selectionIndex = 3 ifTrue: [^object tempsAndValues].
  	^object debuggerMap namedTempAt: selectionIndex - 3 in: object!