diff --git a/README.md b/README.md
index 4d17934..44f67b0 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Nexus 10 (L)
 
 #### Gradle
 ```groovy
-    compile 'com.github.k0shk0sh:PermissionHelper:1.0.12'
+    compile 'com.github.k0shk0sh:PermissionHelper:1.0.13'
 ```
 
 #### Maven
diff --git a/gradle.properties b/gradle.properties
index 6f0d9aa..635cc43 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
-VERSION_NAME=1.0.12
-VERSION_CODE=12
+VERSION_NAME=1.0.13
+VERSION_CODE=13
 GROUP=com.github.k0shk0sh
 POM_DESCRIPTION=A Library that simplify Android Runtime Permissions
 POM_URL=https://github.com/k0shk0sh/PermissionHelper
diff --git a/permission/build.gradle b/permission/build.gradle
index 570b97a..cc29276 100644
--- a/permission/build.gradle
+++ b/permission/build.gradle
@@ -8,8 +8,8 @@ android {
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 24
-        versionCode 12
-        versionName "1.0.12"
+        versionCode 13
+        versionName "1.0.13"
     }
     buildTypes {
         release {
diff --git a/permission/src/main/java/com/fastaccess/permission/base/PermissionHelper.java b/permission/src/main/java/com/fastaccess/permission/base/PermissionHelper.java
index e38b2cf..84ed1c3 100644
--- a/permission/src/main/java/com/fastaccess/permission/base/PermissionHelper.java
+++ b/permission/src/main/java/com/fastaccess/permission/base/PermissionHelper.java
@@ -164,17 +164,18 @@ private void handleSingle(@NonNull String permissionName) {
     /**
      * internal usage.
      */
-    private void handleMulti(@NonNull String[] permissionsName) {
-        String[] permissions = declinedPermissions(context, permissionsName);
-        if (permissions.length == 0) {
-            permissionCallback.onPermissionGranted(permissionsName);
+    private void handleMulti(@NonNull String[] permissionNames) {
+        List<String> permissions = declinedPermissionsAsList(context, permissionNames);
+        if (permissions.isEmpty()) {
+            permissionCallback.onPermissionGranted(permissionNames);
             return;
         }
-        for (String permission : permissions) {
-            if (permission != null) {
-                handleSingle(permission);
-            }
+        boolean hasAlertWindowPermission = permissions.contains(Manifest.permission.SYSTEM_ALERT_WINDOW);
+        if (hasAlertWindowPermission) {
+            int index = permissions.indexOf(Manifest.permission.SYSTEM_ALERT_WINDOW);
+            permissions.remove(index);
         }
+        ActivityCompat.requestPermissions(context, permissions.toArray(new String[permissions.size()]), REQUEST_PERMISSIONS);
     }
 
     /**
@@ -310,13 +311,23 @@ public void openSettingsScreen() {
     public static String[] declinedPermissions(@NonNull Context context, @NonNull String[] permissions) {
         List<String> permissionsNeeded = new ArrayList<>();
         for (String permission : permissions) {
-            if (isPermissionDeclined(context, permission)) {
+            if (isPermissionDeclined(context, permission) && permissionExists(context, permission)) {
                 permissionsNeeded.add(permission);
             }
         }
         return permissionsNeeded.toArray(new String[permissionsNeeded.size()]);
     }
 
+    public static List<String> declinedPermissionsAsList(@NonNull Context context, @NonNull String[] permissions) {
+        List<String> permissionsNeeded = new ArrayList<>();
+        for (String permission : permissions) {
+            if (isPermissionDeclined(context, permission) && permissionExists(context, permission)) {
+                permissionsNeeded.add(permission);
+            }
+        }
+        return permissionsNeeded;
+    }
+
     /**
      * return true if permission is granted, false otherwise.
      * <p/>
@@ -406,5 +417,4 @@ public static void removeGrantedPermissions(@NonNull Context context, @NonNull L
             models.removeAll(granted);
         }
     }
-
 }