diff --git a/PORTING/CNN/cnn_model.c b/PORTING/CNN/cnn_model.c
index ce6ddb8..520f0ca 100644
--- a/PORTING/CNN/cnn_model.c
+++ b/PORTING/CNN/cnn_model.c
@@ -61,67 +61,67 @@ u8 modelmym_free(char* model_name){
 	if(conv1_bias.array != NULL && strcmp(model_name, "conv1_bias") == 0){
 		myfree(SRAMEX,conv1_bias.array);
 		conv1_bias.array = NULL;
-		conv1_bias.realength = NULL;
+		conv1_bias.realength = 0;
 		return 1;
 	}
 	else if(conv1_weight.array != NULL && strcmp(model_name, "conv1_weight") == 0){
 		myfree(SRAMEX,conv1_weight.array);
 		conv1_weight.array = NULL;
-		conv1_weight.realength = NULL;
+		conv1_weight.realength = 0;
 		return 1;
 	}
 	else if(conv2_bias.array != NULL && strcmp(model_name, "conv2_bias") == 0){
 		myfree(SRAMEX,conv2_bias.array);
 		conv2_bias.array = NULL;
-		conv2_bias.realength = NULL;
+		conv2_bias.realength = 0;
 		return 1;
 	}
 	else if(conv2_weight.array != NULL && strcmp(model_name, "conv2_weight") == 0){
 		myfree(SRAMEX,conv2_weight.array);
 		conv2_weight.array = NULL;
-		conv2_weight.realength = NULL;
+		conv2_weight.realength = 0;
 		return 1;
 	}
 	else if(conv3_bias.array != NULL && strcmp(model_name, "conv3_bias") == 0){
 		myfree(SRAMEX,conv3_bias.array);
 		conv3_bias.array = NULL;
-		conv3_bias.realength = NULL;
+		conv3_bias.realength = 0;
 		return 1;
 	}
 	else if(conv3_weight.array != NULL && strcmp(model_name, "conv3_weight") == 0){
 		myfree(SRAMEX,conv3_weight.array);
 		conv3_weight.array = NULL;
-		conv3_weight.realength = NULL;
+		conv3_weight.realength = 0;
 		return 1;
 	}
 	else if(fc1_bias.array != NULL && strcmp(model_name, "fc1_bias") == 0){
 		myfree(SRAMEX,fc1_bias.array);
 		fc1_bias.array = NULL;
-		fc1_bias.realength = NULL;
+		fc1_bias.realength = 0;
 		return 1;
 	}
 	else if(fc1_weight.array != NULL && strcmp(model_name, "fc1_weight") == 0){
 		myfree(SRAMEX,fc1_weight.array);
 		fc1_weight.array = NULL;
-		fc1_weight.realength = NULL;
+		fc1_weight.realength = 0;
 		return 1;
 	}
 	else if(fc2_bias.array != NULL && strcmp(model_name, "fc2_bias") == 0){
 		myfree(SRAMEX,fc2_bias.array);
 		fc2_bias.array = NULL;
-		fc2_bias.realength = NULL;
+		fc2_bias.realength = 0;
 		return 1;
 	}
 	else if(fc2_weight.array != NULL && strcmp(model_name, "fc2_weight") == 0){
 		myfree(SRAMEX,fc2_weight.array);
 		fc2_weight.array = NULL;
-		fc2_weight.realength = NULL;
+		fc2_weight.realength = 0;
 		return 1;
 	}
 	else if(data.array != NULL && strcmp(model_name, "data") == 0){
 		myfree(SRAMEX,data.array);
 		data.array = NULL;
-		data.realength = NULL;
+		data.realength = 0;
 		return 1;
 	}
 	else if(strcmp(model_name, "all") == 0){