Use instVarNamed:.

src/IDE.st

@@ -1236,7 +1236,7 @@ allVariables
 	all := Dictionary new.
 
 	self receiver class allInstanceVariableNames do: [ :each |
-		all at: each put: (self receiver instVarAt: each) ].
+		all at: each put: (self receiver instVarNamed: each) ].
 	
 	selectedContext locals keysAndValuesDo: [ :key :value |
 		all at: key put: value ].