Merge pull request #12409 from dkurt:fix_12407

modules/dnn/src/dnn.cpp

@@ -2692,8 +2692,7 @@ void Net::setInput(InputArray blob, const String& name, double scalefactor, cons
 Mat Net::getParam(LayerId layer, int numParam)
 {
     LayerData &ld = impl->getLayerData(layer);
-
-    std::vector<Mat> &layerBlobs = ld.layerInstance->blobs;
+    std::vector<Mat> &layerBlobs = ld.getLayerInstance()->blobs;
     CV_Assert(numParam < (int)layerBlobs.size());
     return layerBlobs[numParam];
 }
@@ -2702,7 +2701,7 @@ void Net::setParam(LayerId layer, int numParam, const Mat &blob)
 {
     LayerData &ld = impl->getLayerData(layer);
 
-    std::vector<Mat> &layerBlobs = ld.layerInstance->blobs;
+    std::vector<Mat> &layerBlobs = ld.getLayerInstance()->blobs;
     CV_Assert(numParam < (int)layerBlobs.size());
     //we don't make strong checks, use this function carefully
     layerBlobs[numParam] = blob;