diff --git a/build/darknet/x64/partial.cmd b/build/darknet/x64/partial.cmd
index f6225156..26a701a9 100644
--- a/build/darknet/x64/partial.cmd
+++ b/build/darknet/x64/partial.cmd
@@ -5,6 +5,7 @@ rem Download Yolo9000: http://pjreddie.com/media/files/yolo9000.weights
 
 rem darknet.exe partial cfg/tiny-yolo-voc.cfg tiny-yolo-voc.weights tiny-yolo-voc.conv.13 13
 
+darknet.exe partial cfg/yolov4-tiny.cfg yolov4-tiny.weights yolov4-tiny.conv.29 29
 
 
 darknet.exe partial cfg/yolov4-sam-mish.cfg cfg/yolov4-sam-mish.weights cfg/yolov4-sam-mish.conv.137 137
diff --git a/src/parser.c b/src/parser.c
index 23c28383..58a6ee3f 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -386,7 +386,7 @@ int *parse_yolo_mask(char *a, int *num)
     return mask;
 }
 
-float *get_classes_multipliers(char *cpc, const int classes)
+float *get_classes_multipliers(char *cpc, const int classes, const float max_delta)
 {
     float *classes_multipliers = NULL;
     if (cpc) {
@@ -398,9 +398,15 @@ float *get_classes_multipliers(char *cpc, const int classes)
         }
         float max_counter = 0;
         int i;
-        for (i = 0; i < classes_counters; ++i) if (max_counter < counters_per_class[i]) max_counter = counters_per_class[i];
+        for (i = 0; i < classes_counters; ++i) {
+            if (counters_per_class[i] < 1) counters_per_class[i] = 1;
+            if (max_counter < counters_per_class[i]) max_counter = counters_per_class[i];
+        }
         classes_multipliers = (float *)calloc(classes_counters, sizeof(float));
-        for (i = 0; i < classes_counters; ++i) classes_multipliers[i] = max_counter / counters_per_class[i];
+        for (i = 0; i < classes_counters; ++i) {
+            classes_multipliers[i] = max_counter / counters_per_class[i];
+            if(classes_multipliers[i] > max_delta) classes_multipliers[i] = max_delta;
+        }
         free(counters_per_class);
         printf(" classes_multipliers: ");
         for (i = 0; i < classes_counters; ++i) printf("%.1f, ", classes_multipliers[i]);
@@ -425,13 +431,13 @@ layer parse_yolo(list *options, size_params params)
     }
     //assert(l.outputs == params.inputs);
 
+    l.max_delta = option_find_float_quiet(options, "max_delta", FLT_MAX);   // set 10
     char *cpc = option_find_str(options, "counters_per_class", 0);
-    l.classes_multipliers = get_classes_multipliers(cpc, classes);
+    l.classes_multipliers = get_classes_multipliers(cpc, classes, l.max_delta);
 
     l.label_smooth_eps = option_find_float_quiet(options, "label_smooth_eps", 0.0f);
     l.scale_x_y = option_find_float_quiet(options, "scale_x_y", 1);
     l.objectness_smooth = option_find_int_quiet(options, "objectness_smooth", 0);
-    l.max_delta = option_find_float_quiet(options, "max_delta", FLT_MAX);   // set 10
     l.iou_normalizer = option_find_float_quiet(options, "iou_normalizer", 0.75);
     l.cls_normalizer = option_find_float_quiet(options, "cls_normalizer", 1);
     char *iou_loss = option_find_str_quiet(options, "iou_loss", "mse");   //  "iou");
@@ -534,14 +540,13 @@ layer parse_gaussian_yolo(list *options, size_params params) // Gaussian_YOLOv3
         exit(EXIT_FAILURE);
     }
     //assert(l.outputs == params.inputs);
-
+    l.max_delta = option_find_float_quiet(options, "max_delta", FLT_MAX);   // set 10
     char *cpc = option_find_str(options, "counters_per_class", 0);
-    l.classes_multipliers = get_classes_multipliers(cpc, classes);
+    l.classes_multipliers = get_classes_multipliers(cpc, classes, l.max_delta);
 
     l.label_smooth_eps = option_find_float_quiet(options, "label_smooth_eps", 0.0f);
     l.scale_x_y = option_find_float_quiet(options, "scale_x_y", 1);
     l.objectness_smooth = option_find_int_quiet(options, "objectness_smooth", 0);
-    l.max_delta = option_find_float_quiet(options, "max_delta", FLT_MAX);   // set 10
     l.uc_normalizer = option_find_float_quiet(options, "uc_normalizer", 1.0);
     l.iou_normalizer = option_find_float_quiet(options, "iou_normalizer", 0.75);
     l.cls_normalizer = option_find_float_quiet(options, "cls_normalizer", 1.0);
diff --git a/src/yolo_layer.c b/src/yolo_layer.c
index be56972c..1f609f7a 100644
--- a/src/yolo_layer.c
+++ b/src/yolo_layer.c
@@ -416,7 +416,9 @@ void forward_yolo_layer(const layer l, network_state state)
 
                             int class_id = state.truth[best_match_t*(4 + 1) + b*l.truths + 4];
                             if (l.map) class_id = l.map[class_id];
-                            delta_yolo_class(l.output, l.delta, class_index, class_id, l.classes, l.w*l.h, 0, l.focal_loss, l.label_smooth_eps, l.classes_multipliers);
+                            if (class_id < l.classes && class_id >= 0) {
+                                delta_yolo_class(l.output, l.delta, class_index, class_id, l.classes, l.w*l.h, 0, l.focal_loss, l.label_smooth_eps, l.classes_multipliers);
+                            }
                         }
                         else l.delta[obj_index] = 0;
                     }