diff --git a/src/controllers/functions/grabAndClone.ts b/src/controllers/functions/grabAndClone.ts
index 1add482..b34fb8f 100644
--- a/src/controllers/functions/grabAndClone.ts
+++ b/src/controllers/functions/grabAndClone.ts
@@ -1,12 +1,16 @@
 import {AbstractMesh, Vector3} from "@babylonjs/core";
 import {DiagramManager} from "../../diagram/diagramManager";
 import {DiagramObject} from "../../objects/diagramObject";
+import log from "loglevel";
 
 export function grabAndClone(diagramManager: DiagramManager, mesh: AbstractMesh, parent: AbstractMesh):
     DiagramObject {
+    const logger = log.getLogger('grabAndClone');
     if (diagramManager.isDiagramObject(mesh)) {
+        logger.debug('grabAndClone called with diagram object', mesh.id);
         const diagramObject = diagramManager.createCopy(mesh.id);
         if (!diagramObject) {
+            logger.warn('grabAndClone called with invalid diagram object', mesh.id);
             return null;
         }
         diagramObject.baseTransform.setParent(parent);
diff --git a/src/diagram/diagramManager.ts b/src/diagram/diagramManager.ts
index 1919baa..d117171 100644
--- a/src/diagram/diagramManager.ts
+++ b/src/diagram/diagramManager.ts
@@ -11,7 +11,7 @@ import {DiagramObject} from "../objects/diagramObject";
 
 
 export class DiagramManager {
-    private logger = log.getLogger('DiagramManager');
+    private readonly _logger = log.getLogger('DiagramManager');
     public readonly _config: AppConfig;
     private readonly _controllers: Controllers;
     private readonly _diagramEntityActionManager: ActionManager;
@@ -49,7 +49,7 @@ export class DiagramManager {
             }
 
         });
-        this.logger.debug("DiagramManager constructed");
+        this._logger.debug("DiagramManager constructed");
     }
 
     public get actionManager(): AbstractActionManager {
@@ -76,6 +76,7 @@ export class DiagramManager {
     public createCopy(id: string): DiagramObject {
         const diagramObject = this._diagramObjects.get(id);
         if (!diagramObject) {
+            this._logger.warn('createCopy called with invalid diagram object', id);
             return null;
         }
         const obj = diagramObject.clone();
diff --git a/src/objects/diagramObject.ts b/src/objects/diagramObject.ts
index 037968c..935bc48 100644
--- a/src/objects/diagramObject.ts
+++ b/src/objects/diagramObject.ts
@@ -109,7 +109,7 @@ export class DiagramObject {
 
     public clone(): DiagramObject {
         const clone = new DiagramObject(this._scene, this._eventObservable, {actionManager: this._mesh.actionManager});
-        const newEntity = {...this._diagramEntity};
+        const newEntity: DiagramEntity = {...this._diagramEntity};
         newEntity.id = 'id' + uuidv4();
         clone.fromDiagramEntity(this._diagramEntity);
         this._logger.debug('DiagramObject clone called', clone, this._diagramEntity, newEntity);