diff --git a/init.go b/init.go
index e307262..453d162 100644
--- a/init.go
+++ b/init.go
@@ -49,7 +49,11 @@ func (me *TreeInfo) newAction(a widget.Action) {
 	case widget.Checked:
 		switch n.WidgetType {
 		case widget.Checkbox:
-			me.SetChecked(n, a.State.Checked)
+			if me.SetChecked == nil {
+				log.Log(TREEWARN, "SetChecked() == nil in toolkit", me.PluginName)
+			} else {
+				me.SetChecked(n, a.State.Checked)
+			}
 		default:
 			log.Log(TREEWARN, "SetChecked() not supported on widget", n.WidgetType, n.String())
 		}
@@ -61,9 +65,10 @@ func (me *TreeInfo) newAction(a widget.Action) {
 func (me *TreeInfo) catchActionChannel() {
 	defer func() {
 		if r := recover(); r != nil {
-			log.Log(TREEWARN, me.PluginName, "tree YAHOOOO Recovered in simpleStdin()", r)
+			log.Log(TREEWARN, "YAHOOOO Recovered in tree.catchActionChannel()", r)
+			log.Log(TREEWARN, "YAHOOOO Recovered in tree.catchActionChannel() Plugin:", me.PluginName)
 			me.SendToolkitPanic()
-			panic(-1)
+			me.ToolkitClose()
 		}
 	}()
 	log.Log(TREE, "catchActionChannel() START")
diff --git a/structs.go b/structs.go
index f96158d..cfd21db 100644
--- a/structs.go
+++ b/structs.go
@@ -31,6 +31,7 @@ type TreeInfo struct {
 	SetTitle   func(*Node, string)
 	SetLabel   func(*Node, string)
 	SetChecked func(*Node, bool)
+	ToolkitClose func()
 }
 
 type Node struct {