diff --git a/app/src/main/java/io/legado/app/ui/book/read/config/PageKeyDialog.kt b/app/src/main/java/io/legado/app/ui/book/read/config/PageKeyDialog.kt
index 28a46b7f2..d85aae294 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/config/PageKeyDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/config/PageKeyDialog.kt
@@ -8,6 +8,7 @@ import io.legado.app.constant.PreferKey
 import io.legado.app.utils.getPrefInt
 import io.legado.app.utils.hideSoftInput
 import io.legado.app.utils.putPrefInt
+import io.legado.app.utils.removePref
 import kotlinx.android.synthetic.main.dialog_page_key.*
 import org.jetbrains.anko.sdk27.listeners.onClick
 
@@ -19,11 +20,17 @@ class PageKeyDialog(context: Context) : Dialog(context, R.style.AppTheme_AlertDi
         et_prev.setText(context.getPrefInt(PreferKey.prevKey).toString())
         et_next.setText(context.getPrefInt(PreferKey.nextKey).toString())
         tv_ok.onClick {
-            et_prev.text?.let {
-                context.putPrefInt(PreferKey.prevKey, it.toString().toInt())
+            val prevKey = et_prev.text?.toString()
+            if (prevKey.isNullOrEmpty()) {
+                context.removePref(PreferKey.prevKey)
+            } else {
+                context.putPrefInt(PreferKey.prevKey, prevKey.toInt())
             }
-            et_next.text?.let {
-                context.putPrefInt(PreferKey.nextKey, it.toString().toInt())
+            val nextKey = et_next.text?.toString()
+            if (nextKey.isNullOrEmpty()) {
+                context.removePref(PreferKey.nextKey)
+            } else {
+                context.putPrefInt(PreferKey.nextKey, nextKey.toInt())
             }
             dismiss()
         }