diff --git a/modules/dnn/src/layers/max_unpooling_layer.cpp b/modules/dnn/src/layers/max_unpooling_layer.cpp
index e0c105dd4c..daac57854c 100644
--- a/modules/dnn/src/layers/max_unpooling_layer.cpp
+++ b/modules/dnn/src/layers/max_unpooling_layer.cpp
@@ -14,6 +14,8 @@ Implementation of Batch Normalization layer.
 #include "op_halide.hpp"
 #include <opencv2/dnn/shape_utils.hpp>
 
+#include <iostream>
+
 namespace cv
 {
 namespace dnn
@@ -94,7 +96,20 @@ public:
                 for(int i_wh = 0; i_wh < wh_area; i_wh++)
                 {
                     int index = idxptr[i_wh];
-                    CV_Assert(0 <= index && index < outPlaneTotal);
+                    if (!(0 <= index && index < outPlaneTotal))
+                    {
+                        std::cerr
+                            << "i_n=" << i_n << std::endl
+                            << "i_c=" << i_c << std::endl
+                            << "i_wh=" << i_wh << std::endl
+                            << "index=" << index << std::endl
+                            << "outPlaneTotal=" << outPlaneTotal << std::endl
+                            << "input.size=" << input.size << std::endl
+                            << "indices.size=" << indices.size << std::endl
+                            << "outBlob=" << outBlob.size << std::endl
+                            ;
+                        CV_Assert(0 <= index && index < outPlaneTotal);
+                    }
                     outptr[index] = inptr[i_wh];
                 }
             }