diff --git a/openair2/LAYER2/MAC/config.c b/openair2/LAYER2/MAC/config.c
index 6182d21a74cf9cc38072814c51e7de6b067555d4..204c59d3c395b9a298c642cc4f91ed65b12b9ca8 100644
--- a/openair2/LAYER2/MAC/config.c
+++ b/openair2/LAYER2/MAC/config.c
@@ -165,7 +165,7 @@ int rrc_mac_config_req(module_id_t Mod_id, eNB_flag_t eNB_flagP,uint8_t UE_id,ui
               LOG_D(MAC,"[CONFIG][UE %d] LCID %d is attached to the LCGID %d\n",Mod_id,logicalChannelIdentity,*logicalChannelConfig->ul_SpecificParameters->logicalChannelGroup);
           } else {
               LOG_E(MAC,"[CONFIG][UE %d] LCID %d NULL ul_SpecificParameters\n",Mod_id,logicalChannelIdentity);
-              mac_xface->macphy_exit("");
+              mac_xface->macphy_exit("NULL ul_SpecificParameters");
           }
       }
   }
diff --git a/openair2/LAYER2/MAC/eNB_scheduler.c b/openair2/LAYER2/MAC/eNB_scheduler.c
index 34ac1376a98636c0e5c382774376df9152321de4..33a211ad9b30993577bf9ce664ae5b74909adc75 100644
--- a/openair2/LAYER2/MAC/eNB_scheduler.c
+++ b/openair2/LAYER2/MAC/eNB_scheduler.c
@@ -524,7 +524,7 @@ void SR_indication(module_id_t enb_mod_idP, frame_t frameP, rnti_t rntiP, sub_fr
       eNB_mac_inst[enb_mod_idP].UE_template[ue_mod_id].ul_active = TRUE;
   } else {
     //     AssertFatal(0, "find_UE_id(%u,rnti %d) not found", enb_mod_idP, rntiP);
-    AssertError(0, 0, "find_UE_id(%u,rnti %d) not found\n", enb_mod_idP, rntiP);
+    AssertError(0, 0, "Frame %d: find_UE_id(%u,rnti %d) not found\n", frameP, enb_mod_idP, rntiP);
   }
 }
 
@@ -3616,7 +3616,7 @@ void schedule_ue_spec(module_id_t   module_idP,
       eNB_mac_inst[module_idP].eNB_UE_stats[ue_mod_id].rrc_status=mac_get_rrc_status(module_idP,1,ue_mod_id);
       if (rnti==0) {
           LOG_E(MAC,"Cannot find rnti for UE_id %d (granted UEs %d)\n",ue_mod_id,granted_UEs);
-          mac_xface->macphy_exit("");//continue;
+          mac_xface->macphy_exit("Cannot find rnti for UE_id");//continue;
       }
 
       eNB_UE_stats = mac_xface->get_eNB_UE_stats(module_idP,rnti);
diff --git a/openair2/LAYER2/MAC/l1_helpers.c b/openair2/LAYER2/MAC/l1_helpers.c
index 7f68c3cd385e6e74dcf0d038ce9f369e650d5fc1..ef1e921a78d52124c938d1ee9df48c46215449d4 100644
--- a/openair2/LAYER2/MAC/l1_helpers.c
+++ b/openair2/LAYER2/MAC/l1_helpers.c
@@ -46,7 +46,7 @@ int8_t get_Po_NOMINAL_PUSCH(module_id_t module_idP) {
     rach_ConfigCommon = &UE_mac_inst[module_idP].radioResourceConfigCommon->rach_ConfigCommon;
   else {
     LOG_E(MAC,"[UE %d] FATAL radioResourceConfigCommon is NULL !!!\n",module_idP);
-    mac_xface->macphy_exit("");
+    mac_xface->macphy_exit("FATAL radioResourceConfigCommon is NULL");
   }
 
   return(-120 + (rach_ConfigCommon->powerRampingParameters.preambleInitialReceivedTargetPower<<1) +