diff --git a/src/main/kotlin/application/controller/MenuBarController.kt b/src/main/kotlin/application/controller/MenuBarController.kt
index d3846b5..672410a 100644
--- a/src/main/kotlin/application/controller/MenuBarController.kt
+++ b/src/main/kotlin/application/controller/MenuBarController.kt
@@ -10,9 +10,11 @@ import javafx.fxml.FXML
 import javafx.fxml.Initializable
 import javafx.scene.control.*
 import javafx.stage.FileChooser
+import java.io.*
 import java.net.URL
 import java.util.*
 
+
 class MenuBarController : Initializable {
 
     @FXML
@@ -60,6 +62,7 @@ class MenuBarController : Initializable {
             fileChooser.title = "Choose a file to import"
             val window = menuBar.scene.window
             val file = fileChooser.showOpenDialog(window)
+
             try {
                 if (file.extension != "csv") {
                     val alert = Alert(Alert.AlertType.WARNING)
@@ -68,15 +71,36 @@ class MenuBarController : Initializable {
                     alert.contentText = "Please choose à .csv file."
                     alert.showAndWait()
                 }
-                val vessels = createVesselCollection(file)
                 observableVessel.vessels.clear()
-                observableVessel.vessels = vessels
+                if(toMuchVessel(file)){
+                    observableVessel.vessels = mutableMapOf()
+                }else {
+                    val vessels = createVesselCollection(file)
+                    observableVessel.vessels = vessels
+                }
             } catch (ignore: IllegalStateException) {
 
             }
         }
     }
 
+    private fun toMuchVessel(file: File): Boolean {
+        val nbLine = file.readLines().size
+        if (nbLine > 50000) {
+            val alert = Alert(Alert.AlertType.CONFIRMATION)
+            alert.title = "Warning!!"
+            alert.headerText = "Warning: This file contain a lot of messages."
+            alert.contentText = "Are you sure you want to continue."
+            val buttonTypeYes = ButtonType("Yes")
+            val buttonTypeNo = ButtonType("No ")
+            alert.buttonTypes.setAll(buttonTypeYes, buttonTypeNo)
+            val result = alert.showAndWait()
+
+            return result.get() != buttonTypeYes
+        }
+        return false
+    }
+
     private fun setOnActionAllMessageButton() {
         allMessages.onAction = EventHandler {
             observableMapState.state = ALL_MESSAGES