diff --git a/lib/amdgpu.pm b/lib/amdgpu.pm
index bb79426..94b9d6a 100644
--- a/lib/amdgpu.pm
+++ b/lib/amdgpu.pm
@@ -245,6 +245,7 @@ sub amdgpu_update {
 			if(lc($amdgpu->{alerts}->{coretemp_enabled}) eq "y") {
 				my $sensorIndex = 1;
 				$config->{amdgpu_hist_alert1}->{$n} = 0
+				if(!$config->{amdgpu_hist_alert1}->{$n});
 				if($sensors[$sensorIndex] >= $amdgpu->{alerts}->{coretemp_threshold} && $config->{amdgpu_hist_alert1}->{$n} < $sensors[$sensorIndex]) {
 					if(-x $amdgpu->{alerts}->{coretemp_script}) {
 						logger("$myself: ALERT: executing script '$amdgpu->{alerts}->{coretemp_script}'.");
@@ -258,6 +259,7 @@ sub amdgpu_update {
 			if(lc($amdgpu->{alerts}->{memorytemp_enabled}) eq "y") {
 				my $sensorIndex = 2;
 				$config->{amdgpu_hist_alert2}->{$n} = 0
+				if(!$config->{amdgpu_hist_alert2}->{$n});
 				if($sensors[$sensorIndex] >= $amdgpu->{alerts}->{memorytemp_threshold} && $config->{amdgpu_hist_alert2}->{$n} < $sensors[$sensorIndex]) {
 					if(-x $amdgpu->{alerts}->{memorytemp_script}) {
 						logger("$myself: ALERT: executing script '$amdgpu->{alerts}->{memorytemp_script}'.");
diff --git a/lib/nvme.pm b/lib/nvme.pm
index e9095fb..046a8ef 100644
--- a/lib/nvme.pm
+++ b/lib/nvme.pm
@@ -264,6 +264,7 @@ sub nvme_update {
 			if(lc($nvme->{alerts}->{availspare_enabled}) eq "y") {
 				my $smartIndex = 1;
 				$config->{nvme_hist_alert1}->{$n} = 0
+				if(!$config->{nvme_hist_alert1}->{$n});
 				if($smart[$smartIndex] <= $nvme->{alerts}->{availspare_threshold} && $config->{nvme_hist_alert1}->{$n} < $smart[$smartIndex]) {
 					if(-x $nvme->{alerts}->{availspare_script}) {
 						logger("$myself: ALERT: executing script '$nvme->{alerts}->{availspare_script}'.");
@@ -277,6 +278,7 @@ sub nvme_update {
 			if(lc($nvme->{alerts}->{percentused_enabled}) eq "y") {
 				my $smartIndex = 2;
 				$config->{nvme_hist_alert2}->{$n} = 0
+				if(!$config->{nvme_hist_alert2}->{$n});
 				if($smart[$smartIndex] >= $nvme->{alerts}->{percentused_threshold} && $config->{nvme_hist_alert2}->{$n} < $smart[$smartIndex]) {
 					if(-x $nvme->{alerts}->{percentused_script}) {
 						logger("$myself: ALERT: executing script '$nvme->{alerts}->{percentused_script}'.");