diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/MultiFileItem.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/MultiFileItem.java
index cd15677c5..7b2822f32 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/MultiFileItem.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/MultiFileItem.java
@@ -226,6 +226,11 @@ public class MultiFileItem<T> extends VBox {
 
             BorderPane.setAlignment(customField, Pos.CENTER_RIGHT);
             customField.disableProperty().bind(left.selectedProperty().not());
+
+            if (!customField.getValidators().isEmpty()) {
+                FXUtils.setValidateWhileTextChanged(customField, true);
+            }
+
             pane.setRight(customField);
 
             return pane;
diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/main/PersonalizationPage.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/main/PersonalizationPage.java
index 71f8ed3c3..8544953e0 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/ui/main/PersonalizationPage.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/main/PersonalizationPage.java
@@ -107,6 +107,7 @@ public class PersonalizationPage extends StackPane {
                             .setChooserTitle(i18n("launcher.background.choose"))
                             .bindBidirectional(config().backgroundImageProperty()),
                     new MultiFileItem.StringOption<>(i18n("launcher.background.network"), EnumBackgroundImage.NETWORK)
+                            .setValidators(new URLValidator(true))
                             .bindBidirectional(config().backgroundImageUrlProperty())
             ));
             backgroundItem.selectedDataProperty().bindBidirectional(config().backgroundImageTypeProperty());