diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index 7854cabe1..7b8ad5a25 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -390,13 +390,21 @@ static int log_collection_upload_on_send_body(belle_sip_user_body_handler_t *bh,
 #else
 		FILE *log_file = fopen(log_filename, "r");
 #endif
-		fseek(log_file, offset, SEEK_SET);
-		*size = fread(buffer, 1, *size, log_file);
+		if (fseek(log_file, offset, SEEK_SET)) {
+			ms_error("Cannot seek file [%s] at position [%lu] errno [%s]",log_filename,(unsigned long)offset,strerror(errno));
+
+		} else {
+			*size = fread(buffer, 1, *size, log_file);
+		}
 		fclose(log_file);
 		ms_free(log_filename);
+		return BELLE_SIP_CONTINUE;
+	} else {
+		*size=0;
+		return BELLE_SIP_STOP;
 	}
 
-	return BELLE_SIP_CONTINUE;
+
 }
 
 /**
@@ -7391,3 +7399,12 @@ void linphone_core_multicast_lock_release(LinphoneCore *lc) {
 			ms_warning("No wifi lock configured or not usable for core [%p]",lc);
 }
 #endif
+
+
+LINPHONE_PUBLIC const char *linphone_core_log_collection_upload_state_to_string(const LinphoneCoreLogCollectionUploadState lcus) {
+	switch (lcus) {
+	case LinphoneCoreLogCollectionUploadStateInProgress : return "LinphoneCoreLogCollectionUploadStateInProgress";
+	case LinphoneCoreLogCollectionUploadStateDelivered : return "LinphoneCoreLogCollectionUploadStateDelivered";
+	case LinphoneCoreLogCollectionUploadStateNotDelivered : return "LinphoneCoreLogCollectionUploadStateNotDelivered";
+	}
+}
diff --git a/coreapi/linphonecore.h b/coreapi/linphonecore.h
index 22788939a..53f8cbcfb 100644
--- a/coreapi/linphonecore.h
+++ b/coreapi/linphonecore.h
@@ -1636,6 +1636,8 @@ typedef enum _LinphoneCoreLogCollectionUploadState {
 	LinphoneCoreLogCollectionUploadStateNotDelivered, /**< Log collection upload was not delivered */
 } LinphoneCoreLogCollectionUploadState;
 
+LINPHONE_PUBLIC const char *linphone_core_log_collection_upload_state_to_string(const LinphoneCoreLogCollectionUploadState lcus);
+
 /**
  * Global state notification callback.
  * @param lc
diff --git a/tester/log_collection_tester.c b/tester/log_collection_tester.c
index 32605c863..52a5d5133 100644
--- a/tester/log_collection_tester.c
+++ b/tester/log_collection_tester.c
@@ -273,6 +273,9 @@ static void collect_files_changing_size()  {
 static void logCollectionUploadStateChangedCb(LinphoneCore *lc, LinphoneCoreLogCollectionUploadState state, const char *info) {
 
 	stats* counters = get_stats(lc);
+	ms_message("lc [%p], logCollectionUploadStateChanged to [%s], info [%s]",lc
+																			,linphone_core_log_collection_upload_state_to_string(state)
+																			,info);
 	switch(state) {
 		case LinphoneCoreLogCollectionUploadStateInProgress:
 			counters->number_of_LinphoneCoreLogCollectionUploadStateInProgress++;