diff --git a/form/build.gradle b/form/build.gradle
index 07cb05e..7f9bbc9 100644
--- a/form/build.gradle
+++ b/form/build.gradle
@@ -15,7 +15,7 @@ ext {
     siteUrl = 'https://github.com/tianzhuqiao/form'
     gitUrl = 'https://github.com/tianzhuqiao/form.git'
 
-    libraryVersion = '0.2.3'
+    libraryVersion = '0.3.0'
 
     developerId = 'tianzhuqiao'
     developerName = 'Tianzhu Qiao'
diff --git a/form/src/main/java/com/feiyilin/form/FormItemSection.kt b/form/src/main/java/com/feiyilin/form/FormItemSection.kt
index 37ee0d6..8f1a4c9 100644
--- a/form/src/main/java/com/feiyilin/form/FormItemSection.kt
+++ b/form/src/main/java/com/feiyilin/form/FormItemSection.kt
@@ -207,7 +207,7 @@ open class FormItemSection(private val visible: Boolean=true): FormItem() {
                 _itemsVisible.add(count, item)
                 if (update) {
                     adapter.activity?.runOnUiThread {
-                        val start = adapter.indexOf(this) ?: -1
+                        val start = adapter.indexOf(this)
                         if (start != -1) {
                             adapter.notifyItemInserted(start + itemsVisible.indexOf(item))
                         }