diff --git a/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt b/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
index 9235543aa..dcab47e66 100644
--- a/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
+++ b/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
@@ -15,10 +15,10 @@ import kotlinx.android.parcel.Parcelize
 data class ReplaceRule(
     @PrimaryKey(autoGenerate = true)
     var id: Int = 0,
-    var name: String? = null,
+    var name: String = "",
     var group: String? = null,
-    var pattern: String? = null,
-    var replacement: String? = null,
+    var pattern: String = "",
+    var replacement: String = "",
     var scope: String? = null,
     var isEnabled: Boolean = true,
     var isRegex: Boolean = true,
diff --git a/app/src/main/java/io/legado/app/help/BookHelp.kt b/app/src/main/java/io/legado/app/help/BookHelp.kt
index 15e2b5c81..b3ae92f19 100644
--- a/app/src/main/java/io/legado/app/help/BookHelp.kt
+++ b/app/src/main/java/io/legado/app/help/BookHelp.kt
@@ -124,8 +124,11 @@ object BookHelp {
     var bookOrigin: String? = null
     var replaceRules: List<ReplaceRule> = arrayListOf()
 
-    fun disposeContent(name: String, origin: String?, content: String, enableReplace: Boolean)
-            : String {
+    fun disposeContent(
+        name: String, origin: String?,
+        content: String,
+        enableReplace: Boolean
+    ): String {
         var c = content
         synchronized(this) {
             if (enableReplace && (bookName != name || bookOrigin != origin)) {
@@ -137,12 +140,12 @@ object BookHelp {
             }
         }
         for (item in replaceRules) {
-            item.pattern?.let {
+            item.pattern.let {
                 if (it.isNotEmpty()) {
                     c = if (item.isRegex) {
-                        c.replace(it.toRegex(), item.replacement ?: "")
+                        c.replace(it.toRegex(), item.replacement)
                     } else {
-                        c.replace(it, item.replacement ?: "")
+                        c.replace(it, item.replacement)
                     }
                 }
             }
diff --git a/app/src/main/java/io/legado/app/ui/replacerule/ReplaceEditActivity.kt b/app/src/main/java/io/legado/app/ui/replacerule/ReplaceEditActivity.kt
index 81ed2b297..464fcf9a9 100644
--- a/app/src/main/java/io/legado/app/ui/replacerule/ReplaceEditActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/replacerule/ReplaceEditActivity.kt
@@ -29,4 +29,5 @@ class ReplaceEditActivity :
         return super.onCompatOptionsItemSelected(item)
     }
 
+
 }