2 files changed, 5 insertions, 0 deletions
diff --git a/init.go b/init.go
index da00c80..6bb8efd 100644
--- a/init.go
+++ b/init.go
@@ -38,7 +38,9 @@ func (me *TreeInfo) catchActionChannel() {
 			muAction.Lock()
 			me.WaitOK()
 			// time.Sleep(10 * time.Millisecond)
+			me.Lock()
 			me.doAction(a)
+			me.Unlock()
 			muAction.Unlock()
 		}
 	}
diff --git a/structs.go b/structs.go
index 53c058a..8e3bc19 100644
--- a/structs.go
+++ b/structs.go
@@ -7,6 +7,8 @@ package tree
 */
 
 import (
+	"sync"
+
 	"go.wit.com/lib/protobuf/guipb"
 	"go.wit.com/widget"
 )
@@ -18,6 +20,7 @@ import (
 var treeRoot *Node
 
 type TreeInfo struct {
+	sync.Mutex                       // a lock around the tree to serialize access
 	ok           bool                // indicates the plugin actually initialized
 	PluginName   string              // used to identify the plugin
 	config       *ToolkitConfigs     // protobuf of plugin settings