fix a few errors

src/main.js

@@ -93,7 +93,7 @@ function forwardConsole(fnName, dest) {
     const stackLines = error.stack.split("\n");
 
     let message = args.join(" ");  // Join all arguments into a single string
-    const location = stackLines[1].match(/([a-zA-Z0-9_-]+\.js:\d+)/);
+    const location = stackLines.length>1 ? stackLines[1].match(/([a-zA-Z0-9_-]+\.js:\d+)/) : stackLines.toString();
 
     if (fnName === "error") {
       // Send the full stack trace for errors
@@ -1322,6 +1322,7 @@ let actions = {
       for (let frameObj of action.selectedFrames) {
         let layer = object.layers[frameObj.layer];
         let frame = layer.frames[frameObj.frameNum];
+        if (frameObj) {
           frameBuffer.push({
             frame: frame,
             frameNum: frameObj.frameNum,
@@ -1329,6 +1330,7 @@ let actions = {
           });
           layer.deleteFrame(frame.idx, undefined, frameObj.replacementUuid);
         }
+      }
       for (let frameObj of frameBuffer) {
         const layer_idx = frameObj.layer + action.offset.layers;
         let layer = object.layers[layer_idx];
@@ -1443,6 +1445,7 @@ let actions = {
       let serializableShapes = [];
       let serializableObjects = [];
       let bbox;
+      const frame = context.activeObject.currentFrame
       for (let shape of context.shapeselection) {
         serializableShapes.push(shape.idx);
         if (bbox == undefined) {
@@ -1452,6 +1455,7 @@ let actions = {
         }
       }
       for (let object of context.selection) {
+        if (object.idx in frame.keys) {
           serializableObjects.push(object.idx);
           // TODO: rotated bbox
           if (bbox == undefined) {
@@ -1460,6 +1464,7 @@ let actions = {
             growBoundingBox(bbox, object.bbox());
           }
         }
+      }
       context.shapeselection = [];
       context.selection = [];
       let action = {
@@ -1467,7 +1472,7 @@ let actions = {
         objects: serializableObjects,
         groupUuid: uuidv4(),
         parent: context.activeObject.idx,
-        frame: context.activeObject.currentFrame.idx,
+        frame: frame.idx,
         layer: context.activeObject.activeLayer.idx,
         position: {
           x: (bbox.x.min + bbox.x.max) / 2,
@@ -2632,7 +2637,6 @@ class Layer extends Widget {
           ctx.setTransform(transform)
         }
       }
-    }
       if (this.activeShape) {
         this.activeShape.draw(cxt)
       }
@@ -2643,6 +2647,7 @@ class Layer extends Widget {
         }
       }
     }
+  }
   bbox() {
     let bbox = super.bbox()
     const frameInfo = this.getFrameValue(this.frameNum);
@@ -4111,9 +4116,11 @@ class GraphicsObject extends Widget {
     for (let layer of this.layers) {
       layer.children = layer.children.filter(child => child.idx !== idx);
       for (let frame of layer.frames) {
+        if (frame) {
           delete frame[idx];
         }
       }
+    }
     // this.children.splice(this.children.indexOf(childObject), 1);
   }
   addLayer(layer) {