Not a string

Check.pm

@@ -75,7 +75,7 @@ sub action
             $lastAge = $incrAge;
         }
         if ( $lastAge < 0 ) {
-            $lastAge = "";
+            $lastAge = 0;
         } else {
             $lastAge = sprintf("%.1f", (time - $lastAge) / (24 * 3600));
         }
@@ -87,12 +87,12 @@ sub action
           $lastAgeColor = "Tomato";
         }
         if ( $fullAge < 0 ) {
-            $fullAge = "";
+            $fullAge = 0;
         } else {
             $fullAge = sprintf("%.1f", (time - $fullAge) / (24 * 3600));
         }
         if ( $incrAge < 0 ) {
-            $incrAge = "";
+            $incrAge = 0;
         } else {
             $incrAge = sprintf("%.1f", (time - $incrAge) / (24 * 3600));
         }