diff --git a/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ManageUserKeyView.kt b/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ManageUserKeyView.kt
index d5c7ddd..6d7c8a5 100644
--- a/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ManageUserKeyView.kt
+++ b/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ManageUserKeyView.kt
@@ -1,5 +1,5 @@
 /*
- * TimeLimit Copyright <C> 2019 - 2020 Jonas Lochmann
+ * TimeLimit Copyright <C> 2019 - 2022 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -46,16 +46,24 @@ object ManageUserKeyView {
 
         view.addKeyButton.setOnClickListener {
             if (auth.requestAuthenticationOrReturnTrue()) {
-                AddUserKeyDialogFragment.newInstance(userId).show(fragmentManager)
+                if (auth.authenticatedUser.value?.second?.id == userId) {
+                    AddUserKeyDialogFragment.newInstance(userId).show(fragmentManager)
+                } else {
+                    ParentKeyWrongUserDialogFragment.newInstance().show(fragmentManager)
+                }
             }
         }
 
         view.removeKeyButton.setOnClickListener {
             if (auth.requestAuthenticationOrReturnTrue()) {
-                val database = auth.database
+                if (auth.authenticatedUser.value?.second?.id == userId) {
+                    val database = auth.database
 
-                Threads.database.execute {
-                    database.userKey().deleteUserKeySync(userId)
+                    Threads.database.execute {
+                        database.userKey().deleteUserKeySync(userId)
+                    }
+                } else {
+                    ParentKeyWrongUserDialogFragment.newInstance().show(fragmentManager)
                 }
             }
         }
diff --git a/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ParentKeyWrongUserDialogFragment.kt b/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ParentKeyWrongUserDialogFragment.kt
new file mode 100644
index 0000000..3831234
--- /dev/null
+++ b/app/src/main/java/io/timelimit/android/ui/manage/parent/key/ParentKeyWrongUserDialogFragment.kt
@@ -0,0 +1,39 @@
+/*
+ * TimeLimit Copyright <C> 2019 - 2022 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package io.timelimit.android.ui.manage.parent.key
+
+import android.app.AlertDialog
+import android.app.Dialog
+import android.os.Bundle
+import androidx.fragment.app.DialogFragment
+import androidx.fragment.app.FragmentManager
+import io.timelimit.android.R
+import io.timelimit.android.extensions.showSafe
+
+class ParentKeyWrongUserDialogFragment: DialogFragment() {
+    companion object {
+        private const val DIALOG_TAG = "ParentKeyWrongUserDialogFragment"
+
+        fun newInstance() = ParentKeyWrongUserDialogFragment()
+    }
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog = AlertDialog.Builder(requireContext(), theme)
+        .setMessage(R.string.manage_user_key_wrong_user)
+        .setPositiveButton(R.string.generic_ok, null)
+        .create()
+
+    fun show(fragmentManager: FragmentManager) = showSafe(fragmentManager, DIALOG_TAG)
+}
\ No newline at end of file
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index b8e74e4..4731917 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -1086,6 +1086,7 @@
     <string name="manage_user_key_added">Der Schlüssel wurde hinzugefügt</string>
     <string name="manage_user_key_invalid">Dies ist kein gültiger TimeLimit-Schlüssel</string>
     <string name="manage_user_key_other_user">Dieser Schlüssel ist schon bei einem anderen Benutzer hinterlegt</string>
+    <string name="manage_user_key_wrong_user">Nur der Benutzer selbst kann seine Schlüssel verwalten</string>
 
     <string name="manage_parent_link_mail_title">E-Mail-Adresse verknüpfen</string>
     <string name="manage_parent_link_mail_status_disabled">Es wurde keine E-Mail-Adresse verknüpft</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 87739e0..2f50582 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1134,6 +1134,7 @@
     <string name="manage_user_key_added">The key was added</string>
     <string name="manage_user_key_invalid">This was no valid TimeLimit key</string>
     <string name="manage_user_key_other_user">This key is already linked to an other user</string>
+    <string name="manage_user_key_wrong_user">Only the user itself can manage his keys</string>
 
     <string name="manage_parent_link_mail_title">Link mail address</string>
     <string name="manage_parent_link_mail_status_disabled">No mail address was linked</string>