diff --git a/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in b/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in
index 205494791..c04a66c42 100644
--- a/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in
+++ b/scripts/ZoneMinder/lib/ZoneMinder/Memory.pm.in
@@ -246,11 +246,12 @@ sub zmMemInit {
 
 sub zmMemVerify {
   my $monitor = shift;
-  if ( !zmMemAttach( $monitor, $mem_size ) ) {
-    return( undef );
+
+  if ( !zmMemAttach($monitor, $mem_size) ) {
+    return undef;
   }
 
-  my $sd_size = zmMemRead( $monitor, 'shared_data:size', 1 );
+  my $sd_size = zmMemRead($monitor, 'shared_data:size', 1);
   if ( $sd_size != $mem_data->{shared_data}->{size} ) {
     if ( $sd_size ) {
       Error( "Shared data size conflict in shared_data for monitor "
@@ -268,9 +269,9 @@ sub zmMemVerify {
           .", got ".$sd_size
           );
     }
-    return( undef );
+    return undef;
   }
-  my $td_size = zmMemRead( $monitor, 'trigger_data:size', 1 );
+  my $td_size = zmMemRead($monitor, 'trigger_data:size', 1);
   if ( $td_size != $mem_data->{trigger_data}->{size} ) {
     if ( $td_size ) {
       Error( "Shared data size conflict in trigger_data for monitor "
@@ -289,14 +290,17 @@ sub zmMemVerify {
           .$td_size
           );
     }
-    return( undef );
+    return undef;
   }
-  if ( !zmMemRead($monitor, 'shared_data:valid',1) ) {
-    Error( "Shared data not valid for monitor $$monitor{Id}" );
-    return( undef );
+  my $valid = zmMemRead($monitor, 'shared_data:valid',1);
+  if ( !$valid ) {
+    Error("Shared data not valid for monitor $$monitor{Id}");
+    return undef;
+  } else {
+    Debug("Shared data appears vaild for monitor $$monitor{Id}: $valid");
   }
 
-  return( !undef );
+  return !undef;
 }
 
 sub zmMemRead {