diff --git a/frame_serialize/ImageMessage.h b/frame_serialize/ImageMessage.h
index 011f9a65..ce7a1659 100644
--- a/frame_serialize/ImageMessage.h
+++ b/frame_serialize/ImageMessage.h
@@ -26,6 +26,7 @@ struct DataMessage {
     CBORImage image;
     std::vector<SpotToSave> spots;
     std::vector<float> rad_int_profile;
+    uint64_t indexing_result; // 0 - not tried, 1 - tried and failed, 2 - tried and success
 };
 
 #endif //JUNGFRAUJOCH_IMAGEMESSAGE_H
diff --git a/frame_serialize/JFJochFrameDeserializer.cpp b/frame_serialize/JFJochFrameDeserializer.cpp
index 410ce2e7..4f9e1137 100644
--- a/frame_serialize/JFJochFrameDeserializer.cpp
+++ b/frame_serialize/JFJochFrameDeserializer.cpp
@@ -47,8 +47,9 @@ inline float GetCBORFloat(CborValue &value) {
 }
 
 inline bool GetCBORBool(CborValue &value) {
-    if (!cbor_value_is_boolean(&value) )
-        throw JFJochException(JFJochExceptionCategory::CBORError, "Bool expected");
+    if (!cbor_value_is_boolean(&value) ) {
+        throw JFJochException(JFJochExceptionCategory::CBORError, "Bool expected " + std::to_string(cbor_value_get_type(&value)));
+    }
     bool tmp;
     cborErr(cbor_value_get_boolean(&value, &tmp));
     cborErr(cbor_value_advance(&value));
@@ -335,6 +336,8 @@ bool JFJochFrameDeserializer::ProcessImageMapElement(CborValue &value) {
             GetCBORSpots(value);
         else if (key == "rad_int_profile")
             GetCBORFloatArray(value, data_message.rad_int_profile);
+        else if (key == "indexing_result")
+            data_message.indexing_result = GetCBORUInt(value);
         else
             cbor_value_advance(&value);
         return true;
diff --git a/frame_serialize/JFJochFrameSerializer.cpp b/frame_serialize/JFJochFrameSerializer.cpp
index 3da90754..e66e324b 100644
--- a/frame_serialize/JFJochFrameSerializer.cpp
+++ b/frame_serialize/JFJochFrameSerializer.cpp
@@ -363,13 +363,14 @@ void JFJochFrameSerializer::SerializeImage(const DataMessage& message) {
 
     CborEncoder encoder, mapEncoder;
     cbor_encoder_init(&encoder, buffer.data(), buffer.size(), 0);
-    cborErr(cbor_encoder_create_map(&encoder, &mapEncoder, 5));
+    cborErr(cbor_encoder_create_map(&encoder, &mapEncoder, 6));
 
     CBOR_ENC(mapEncoder, "type", "image");
     CBOR_ENC(mapEncoder, "image_id", message.number);
     CBOR_ENC(mapEncoder, "data", message.image);
     CBOR_ENC(mapEncoder, "spots", message.spots);
     CBOR_ENC(mapEncoder, "rad_int_profile", message.rad_int_profile);
+    CBOR_ENC(mapEncoder, "indexing_result", message.indexing_result);
 
     cborErr(cbor_encoder_close_container(&encoder, &mapEncoder));
 
diff --git a/receiver/JFJochReceiver.cpp b/receiver/JFJochReceiver.cpp
index 5adebaa2..0be888e0 100644
--- a/receiver/JFJochReceiver.cpp
+++ b/receiver/JFJochReceiver.cpp
@@ -290,7 +290,7 @@ int64_t JFJochReceiver::FrameTransformationThread() {
 
     while (images_to_go.Get(image_number) != 0) {
         try {
-            DataMessage message;
+            DataMessage message{};
             message.number = image_number;
 
             bool send_preview = false;
@@ -376,11 +376,15 @@ int64_t JFJochReceiver::FrameTransformationThread() {
 
                     auto indexer_result = indexer->Run(recip);
 
-                    if (!indexer_result.empty())
+                    if (!indexer_result.empty()) {
+                        message.indexing_result = 2;
                         indexing_solution.AddElement(image_number, 1);
-                    else
+                    } else {
+                        message.indexing_result = 1;
                         indexing_solution.AddElement(image_number, 0);
-                }
+                    }
+                } else
+                    message.indexing_result = 0;
 
                 if (send_bkg_estimate) {
                     uint16_t rad_int_min_bin = std::floor(
diff --git a/tests/CBORTest.cpp b/tests/CBORTest.cpp
index 47345fee..2992c953 100644
--- a/tests/CBORTest.cpp
+++ b/tests/CBORTest.cpp
@@ -46,8 +46,8 @@ TEST_CASE("CBORSerialize_Start", "[CBOR]") {
             .series_unique_id = "bla",
             .series_id = 4567,
             .goniometer = {{"omega", {
-              .increment = 0.1f,
-              .start = 10.0f
+                    .increment = 0.1f,
+                    .start = 10.0f
             }}},
             .detector_translation = {0.5f, 0.0f, 0.5f},
             .source_name = "Swiss Light Source",
@@ -121,11 +121,11 @@ TEST_CASE("CBORSerialize_End", "[CBOR]") {
     JFJochFrameSerializer serializer(8*1024*1024);
 
     EndMessage message {
-        .number_of_images = 57789,
-        .max_receiver_delay = 3456,
-        .efficiency = 0.99,
-        .write_master_file = true,
-        .end_date = "ccc"
+            .number_of_images = 57789,
+            .max_receiver_delay = 3456,
+            .efficiency = 0.99,
+            .write_master_file = true,
+            .end_date = "ccc"
     };
 
     REQUIRE_NOTHROW(serializer.SerializeSequenceEnd(message));
@@ -155,20 +155,21 @@ TEST_CASE("CBORSerialize_Image", "[CBOR]") {
         test[i] = (i * 253 + 56) % 256;
 
     CBORImage image {
-        .data = test.data(),
-        .size = 1024,
-        .xpixel = 256,
-        .ypixel = 2,
-        .pixel_depth_bytes = 2,
-        .pixel_is_signed = true,
-        .algorithm = CompressionAlgorithm::NO_COMPRESSION,
-        .channel = "default"
+            .data = test.data(),
+            .size = 1024,
+            .xpixel = 256,
+            .ypixel = 2,
+            .pixel_depth_bytes = 2,
+            .pixel_is_signed = true,
+            .algorithm = CompressionAlgorithm::NO_COMPRESSION,
+            .channel = "default"
     };
 
     DataMessage message {
-        .number = 456,
-        .image = image,
-        .spots = spots
+            .number = 456,
+            .image = image,
+            .spots = spots,
+            .indexing_result = 1
     };
 
     REQUIRE_NOTHROW(serializer.SerializeImage(message));
@@ -186,6 +187,7 @@ TEST_CASE("CBORSerialize_Image", "[CBOR]") {
     REQUIRE(image_array.image.pixel_is_signed);
     REQUIRE(image_array.image.channel == "default");
     REQUIRE(image_array.image.size == test.size());
+    REQUIRE(image_array.indexing_result == message.indexing_result);
     REQUIRE(image_array.number == 456);
     REQUIRE(memcmp(image_array.image.data, test.data(), test.size()) == 0);
 }
@@ -211,9 +213,10 @@ TEST_CASE("CBORSerialize_Image_2", "[CBOR]") {
     };
 
     DataMessage message {
-            .number = 456,
+            .number = 480,
             .image = image,
-            .spots = spots
+            .spots = spots,
+            .indexing_result = 3
     };
 
     REQUIRE_NOTHROW(serializer.SerializeImage(message));
@@ -232,7 +235,8 @@ TEST_CASE("CBORSerialize_Image_2", "[CBOR]") {
     REQUIRE(!image_array.image.pixel_is_signed);
     REQUIRE(image_array.image.channel == "default");
     REQUIRE(image_array.image.size == test.size());
-    REQUIRE(image_array.number == 456);
+    REQUIRE(image_array.indexing_result == message.indexing_result);
+    REQUIRE(image_array.number == 480);
     REQUIRE(memcmp(image_array.image.data, test.data(), test.size()) == 0);
 }