diff --git a/src/components/form-designer/form-widget/field-widget/date-widget.vue b/src/components/form-designer/form-widget/field-widget/date-widget.vue
index 0148f77..bb2a79d 100644
--- a/src/components/form-designer/form-widget/field-widget/date-widget.vue
+++ b/src/components/form-designer/form-widget/field-widget/date-widget.vue
@@ -72,7 +72,7 @@
             this.fieldModel = [this.fieldModel]
           }
           if (val !== 'dates' && oldVal === 'dates'){
-            this.fieldModel = this.fieldModel[0]
+            this.fieldModel = this.fieldModel ? this.fieldModel[0] : null
           }
         },
       }
diff --git a/src/components/form-designer/setting-panel/property-editor/field-date/date-defaultValue-editor.vue b/src/components/form-designer/setting-panel/property-editor/field-date/date-defaultValue-editor.vue
index b577e0c..d13ffe3 100644
--- a/src/components/form-designer/setting-panel/property-editor/field-date/date-defaultValue-editor.vue
+++ b/src/components/form-designer/setting-panel/property-editor/field-date/date-defaultValue-editor.vue
@@ -26,7 +26,7 @@
             this.optionModel.defaultValue = [this.optionModel.defaultValue]
           }
           if (val !== 'dates' && oldVal === 'dates'){
-            this.optionModel.defaultValue = this.optionModel.defaultValue[0]
+            this.optionModel.defaultValue = this.optionModel.defaultValue ? this.optionModel.defaultValue[0] : null
           }
         },
       }