From b7378e4fd8714f440d375d4215f5c519270dcdc5 Mon Sep 17 00:00:00 2001
From: Carles Fernandez <carles.fernandez@gmail.com>
Date: Tue, 7 Nov 2023 11:58:42 +0100
Subject: [PATCH] Add guard to avoid division by zero

---
 .../gnuradio_blocks/galileo_telemetry_decoder_gs.cc          | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
index 37beb5d43..227bf8e05 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
@@ -1030,7 +1030,10 @@ int galileo_telemetry_decoder_gs::general_work(int noutput_items __attribute__((
                             decode_FNAV_word(d_page_part_symbols.data(), d_frame_length_symbols, current_symbol.CN0_dB_hz);
                             break;
                         case 3:  // CNAV
-                            decode_CNAV_word(current_symbol.Tracking_sample_counter / static_cast<uint64_t>(current_symbol.fs), d_page_part_symbols.data(), d_frame_length_symbols, current_symbol.CN0_dB_hz);
+                            if (current_symbol.fs != 0LL)
+                                {
+                                    decode_CNAV_word(current_symbol.Tracking_sample_counter / static_cast<uint64_t>(current_symbol.fs), d_page_part_symbols.data(), d_frame_length_symbols, current_symbol.CN0_dB_hz);
+                                }
                             break;
                         default:
                             return -1;