diff --git a/contentScript.js b/contentScript.js
index 14fc67f..7036989 100644
--- a/contentScript.js
+++ b/contentScript.js
@@ -395,8 +395,9 @@ if (typeof Overlay === "undefined") {
       }
 
       // Post-warmup
-      const trainedMinutes = minutes - warmupMin;
-      const postWarmup = Math.round((cpm * (trainedMinutes + (seconds / 60))));
+      const trainedMinutes = Math.min(minutes - warmupMin);
+      const trainedSeconds = minutes >= warmupMin ? seconds : 0;
+      const postWarmup = Math.round((cpm * (trainedMinutes + (trainedSeconds / 60))));
 
       // Sum
       return Math.round(preWarmup + postWarmup);