diff --git a/owrx/config/migration.py b/owrx/config/migration.py
index 6db096c8..93e52757 100644
--- a/owrx/config/migration.py
+++ b/owrx/config/migration.py
@@ -162,7 +162,11 @@ class Migrator(object):
     def migrate(config):
         version = config["version"] if "version" in config else 1
         if version == Migrator.currentVersion:
-            return config
+            return
+        elif version > Migrator.currentVersion:
+            raise ValueError(
+                "Configuration version is too high (current: {}, found: {})".format(Migrator.currentVersion, version)
+            )
 
         logger.debug("migrating config from version %i", version)
         migrators = [Migrator.migrators[i] for i in range(version, Migrator.currentVersion)]
diff --git a/owrx/controllers/settings/general.py b/owrx/controllers/settings/general.py
index 231a3c00..e8ccea90 100644
--- a/owrx/controllers/settings/general.py
+++ b/owrx/controllers/settings/general.py
@@ -11,7 +11,7 @@ from owrx.form.input import (
     Option,
 )
 from owrx.form.input.converter import WaterfallColorsConverter, IntConverter
-from owrx.form.input.receiverid import ReceiverKeysConverter
+from owrx.form.input.receiverid import ReceiverKeysInput
 from owrx.form.input.gfx import AvatarInput, TopPhotoInput
 from owrx.form.input.device import WaterfallLevelsInput, WaterfallAutoLevelsInput
 from owrx.form.input.location import LocationInput
@@ -75,12 +75,9 @@ class GeneralSettingsController(SettingsFormController):
             ),
             Section(
                 "Receiver listings",
-                TextAreaInput(
+                ReceiverKeysInput(
                     "receiver_keys",
                     "Receiver keys",
-                    converter=ReceiverKeysConverter(),
-                    infotext="Put the keys you receive on listing sites (e.g. "
-                    + '<a href="https://www.receiverbook.de" target="_blank">Receiverbook</a>) here, one per line',
                 ),
             ),
             Section(
diff --git a/owrx/form/input/__init__.py b/owrx/form/input/__init__.py
index 06a3d79c..57e59b7a 100644
--- a/owrx/form/input/__init__.py
+++ b/owrx/form/input/__init__.py
@@ -163,14 +163,19 @@ class FloatInput(NumberInput):
 class TextAreaInput(Input):
     def render_input(self, value, errors):
         return """
-            <textarea class="{classes}" id="{id}" name="{id}" style="height:200px;" {disabled}>{value}</textarea>
+            <textarea {properties}>{value}</textarea>
         """.format(
-            id=self.id,
-            classes=self.input_classes(errors),
+            properties=self.render_input_properties(value, errors),
             value=value,
-            disabled="disabled" if self.disabled else "",
         )
 
+    def input_properties(self, value, errors):
+        props = super().input_properties(value, errors)
+        props["style"] = "height:200px;"
+        # value works differently on textareas
+        del props["value"]
+        return props
+
 
 class CheckboxInput(Input):
     def __init__(self, id, checkboxText, infotext=None, converter: Converter = None):
diff --git a/owrx/form/input/receiverid.py b/owrx/form/input/receiverid.py
index 0812cc6d..43c0a5de 100644
--- a/owrx/form/input/receiverid.py
+++ b/owrx/form/input/receiverid.py
@@ -1,3 +1,4 @@
+from owrx.form.input import TextAreaInput
 from owrx.form.input.converter import Converter
 
 
@@ -7,4 +8,26 @@ class ReceiverKeysConverter(Converter):
 
     def convert_from_form(self, value):
         # \r\n or \n? this should work with both.
-        return [v.strip("\r ") for v in value.split("\n")]
+        stripped = [v.strip("\r ") for v in value.split("\n")]
+        # omit empty lines
+        return [v for v in stripped if v]
+
+
+class ReceiverKeysInput(TextAreaInput):
+    def __init__(self, id, label):
+        super().__init__(
+            id,
+            label,
+            infotext="Put the keys you receive on listing sites (e.g. "
+            + '<a href="https://www.receiverbook.de" target="_blank">Receiverbook</a>) here, one per line',
+        )
+
+    def input_properties(self, value, errors):
+        props = super().input_properties(value, errors)
+        # disable word wrap on the textarea.
+        # why? keys are longer than the input, and word wrap makes the "one per line" instruction confusing.
+        props["wrap"] = "off"
+        return props
+
+    def defaultConverter(self):
+        return ReceiverKeysConverter()