diff --git a/receiver/JFJochReceiver.cpp b/receiver/JFJochReceiver.cpp
index d6f24935..56d2f5b3 100644
--- a/receiver/JFJochReceiver.cpp
+++ b/receiver/JFJochReceiver.cpp
@@ -504,13 +504,14 @@ void JFJochReceiver::GetStatistics(JFJochProtoBuf::ReceiverOutput &ret) const {
     ret.set_compressed_size(compressed_size);
     ret.set_max_image_number_sent(max_image_number_sent);
 
-    if (experiment.GetImageNum() > 0) {
+    if ((experiment.GetImageNum() > 0) && (compressed_size > 0)) {
         ret.set_compressed_ratio( static_cast<double> (images_sent
                                                        * experiment.GetPixelDepth()
                                                        * experiment.GetModulesNum()
                                                        * RAW_MODULE_SIZE)
                                   / static_cast<double> (compressed_size));
-    }
+    } else
+        ret.set_compressed_ratio(0);
 
     if (!max_delay.empty())
         ret.set_max_receive_delay(*std::max_element(max_delay.begin(), max_delay.end()));