diff --git a/Wabbajack/AppState.cs b/Wabbajack/AppState.cs
index 9eea5bb0..c7ff424b 100644
--- a/Wabbajack/AppState.cs
+++ b/Wabbajack/AppState.cs
@@ -85,6 +85,15 @@ namespace Wabbajack
                 Environment.Exit(1);
             }
 
+            Process[] processList = Process.GetProcesses();
+            foreach (var process in processList)
+            {
+                if (process.ProcessName != "ModOrganizer") continue;
+                MessageBox.Show("You need to close MO2 before running Wabbajack!",
+                    "Error", MessageBoxButton.OK);
+                Environment.Exit(1);
+            }
+
             Mode = mode;
 
             // Define commands