diff --git a/lib/src/common/log_filter.cc b/lib/src/common/log_filter.cc
index 6720c21ad..b498d466c 100644
--- a/lib/src/common/log_filter.cc
+++ b/lib/src/common/log_filter.cc
@@ -126,7 +126,7 @@ void log_filter::all_log(srslte::LOG_LEVEL_ENUM level,
       ss << std::endl; 
     }
     
-    if (hex_limit > 0) {
+    if (hex_limit > 0 && hex && size > 0) {
       ss << hex_string(hex, size);
     } 
     str_ptr s_ptr(new std::string(ss.str()));
diff --git a/srsue/src/phy/phch_worker.cc b/srsue/src/phy/phch_worker.cc
index 81a4554a2..059ba5830 100644
--- a/srsue/src/phy/phch_worker.cc
+++ b/srsue/src/phy/phch_worker.cc
@@ -367,7 +367,7 @@ void phch_worker::work_imp()
   update_measurements();
 
   if (chest_ok) {
-    if (phy->avg_rsrp_dbm > -124.0) {
+    if (phy->avg_rsrp_dbm > -124.0 && 10*log10(srslte_chest_dl_get_snr(&ue_dl.chest)) > -30.0) {
       log_h->debug("SNR=%.1f dB, RSRP=%.1f dBm sync=in-sync from channel estimator\n",
                    10*log10(srslte_chest_dl_get_snr(&ue_dl.chest)), phy->avg_rsrp_dbm);
       chest_loop->in_sync();