diff --git a/scripts/database/entry/activity.JS b/scripts/database/entry/activity.JS
index b6cc58d..06ef6ae 100644
--- a/scripts/database/entry/activity.JS
+++ b/scripts/database/entry/activity.JS
@@ -15,6 +15,9 @@ class Activity extends Entry {
         // Set a default date value. 
         this.date = this.date ? this.date : new Date(Date.now());
         this.set_date(this.date);    
+
+        // Convert the duration to a number if it isn't. 
+        (this.duration) ? this.duration = parseInt(this.duration) : null;
     };
 
     /*