diff --git a/Tranga/TaskExecutor.cs b/Tranga/TaskExecutor.cs
index 9b26e28..deb5666 100644
--- a/Tranga/TaskExecutor.cs
+++ b/Tranga/TaskExecutor.cs
@@ -7,6 +7,10 @@ public static class TaskExecutor
         Connector? connector = connectors.FirstOrDefault(c => c.name == trangaTask.connectorName);
         if (connector is null)
             throw new ArgumentException($"Connector {trangaTask.connectorName} is not a known connector.");
+
+        if (trangaTask.isBeingExecuted)
+            return;
+        trangaTask.isBeingExecuted = true;
         trangaTask.lastExecuted = DateTime.Now;
         
         switch (trangaTask.task)
@@ -21,6 +25,8 @@ public static class TaskExecutor
                 UpdatePublications(connector, chapterCollection);
                 break;
         }
+
+        trangaTask.isBeingExecuted = false;
     }
 
     private static void UpdatePublications(Connector connector, Dictionary<Publication, List<Chapter>> chapterCollection)
diff --git a/Tranga/TrangaTask.cs b/Tranga/TrangaTask.cs
index fe9af96..946068f 100644
--- a/Tranga/TrangaTask.cs
+++ b/Tranga/TrangaTask.cs
@@ -1,4 +1,6 @@
-namespace Tranga;
+using Newtonsoft.Json;
+
+namespace Tranga;
 
 public class TrangaTask
 {
@@ -8,6 +10,7 @@ public class TrangaTask
     public Task task { get; }
     public Publication? publication { get; }
     public string language { get; }
+    [JsonIgnore]public bool isBeingExecuted { get; set; }
 
     public TrangaTask(string connectorName, Task task, Publication? publication, TimeSpan reoccurrence, string language = "")
     {