diff --git a/packages/web/src/components/ThemeProvider/index.jsx b/packages/web/src/components/ThemeProvider/index.jsx
index cb9fca12..d6d17ec3 100644
--- a/packages/web/src/components/ThemeProvider/index.jsx
+++ b/packages/web/src/components/ThemeProvider/index.jsx
@@ -2,7 +2,6 @@ import PropTypes from 'prop-types';
 import CssBaseline from '@mui/material/CssBaseline';
 import { ThemeProvider as BaseThemeProvider } from '@mui/material/styles';
 import clone from 'lodash/clone';
-import get from 'lodash/get';
 import set from 'lodash/set';
 import * as React from 'react';
 
@@ -10,18 +9,33 @@ import useAutomatischInfo from 'hooks/useAutomatischInfo';
 import useAutomatischConfig from 'hooks/useAutomatischConfig';
 import { defaultTheme, mationTheme } from 'styles/theme';
 
+const overrideIfGiven = (theme, key, value) => {
+  if (value) {
+    set(theme, key, value);
+  }
+};
+
 const customizeTheme = (theme, config) => {
   // `clone` is needed so that the new theme reference triggers re-render
   const shallowDefaultTheme = clone(theme);
 
-  for (const key in config) {
-    const value = config[key];
-    const exists = get(theme, key);
+  overrideIfGiven(
+    shallowDefaultTheme,
+    'palette.primary.main',
+    config.palettePrimaryMain,
+  );
 
-    if (exists) {
-      set(shallowDefaultTheme, key, value);
-    }
-  }
+  overrideIfGiven(
+    shallowDefaultTheme,
+    'palette.primary.light',
+    config.palettePrimaryLight,
+  );
+
+  overrideIfGiven(
+    shallowDefaultTheme,
+    'palette.primary.dark',
+    config.palettePrimaryDark,
+  );
 
   return shallowDefaultTheme;
 };
diff --git a/packages/web/src/hooks/useAdminUpdateConfig.js b/packages/web/src/hooks/useAdminUpdateConfig.js
index 03325253..4b5f513b 100644
--- a/packages/web/src/hooks/useAdminUpdateConfig.js
+++ b/packages/web/src/hooks/useAdminUpdateConfig.js
@@ -6,7 +6,7 @@ export default function useAdminUpdateConfig(appKey) {
 
   const query = useMutation({
     mutationFn: async (payload) => {
-      const { data } = await api.patch(`/v1/admin/config`, payload);
+      const { data } = await api.patch('/v1/admin/config', payload);
 
       return data;
     },
diff --git a/packages/web/src/pages/UserInterface/index.jsx b/packages/web/src/pages/UserInterface/index.jsx
index 5c528e10..a91e8152 100644
--- a/packages/web/src/pages/UserInterface/index.jsx
+++ b/packages/web/src/pages/UserInterface/index.jsx
@@ -2,7 +2,7 @@ import LoadingButton from '@mui/lab/LoadingButton';
 import Grid from '@mui/material/Grid';
 import Skeleton from '@mui/material/Skeleton';
 import Stack from '@mui/material/Stack';
-import merge from 'lodash/merge';
+import mergeWith from 'lodash/mergeWith';
 import * as React from 'react';
 
 import ColorInput from 'components/ColorInput';
@@ -10,7 +10,6 @@ import Container from 'components/Container';
 import Form from 'components/Form';
 import PageTitle from 'components/PageTitle';
 import TextField from 'components/TextField';
-import nestObject from 'helpers/nestObject';
 import useAdminUpdateConfig from 'hooks/useAdminUpdateConfig';
 import useAutomatischConfig from 'hooks/useAutomatischConfig';
 import useFormatMessage from 'hooks/useFormatMessage';
@@ -27,9 +26,17 @@ const getPrimaryLightColor = (color) => color || primaryLightColor;
 
 const defaultValues = {
   title: 'Automatisch',
-  'palette.primary.main': primaryMainColor,
-  'palette.primary.dark': primaryDarkColor,
-  'palette.primary.light': primaryLightColor,
+  palettePrimaryMain: primaryMainColor,
+  palettePrimaryDark: primaryDarkColor,
+  palettePrimaryLight: primaryLightColor,
+};
+
+const mergeIfGiven = (oldValue, newValue) => {
+  if (newValue) {
+    return newValue;
+  }
+
+  return oldValue;
 };
 
 export default function UserInterface() {
@@ -39,21 +46,16 @@ export default function UserInterface() {
   const config = configData?.data;
 
   const enqueueSnackbar = useEnqueueSnackbar();
-  const configWithDefaults = merge({}, defaultValues, nestObject(config));
+  const configWithDefaults = mergeWith(defaultValues, config, mergeIfGiven);
+
   const handleUserInterfaceUpdate = async (uiData) => {
     try {
       const input = {
-        title: uiData?.title,
-        'palette.primary.main': getPrimaryMainColor(
-          uiData?.palette?.primary.main,
-        ),
-        'palette.primary.dark': getPrimaryDarkColor(
-          uiData?.palette?.primary.dark,
-        ),
-        'palette.primary.light': getPrimaryLightColor(
-          uiData?.palette?.primary.light,
-        ),
-        'logo.svgData': uiData?.logo?.svgData,
+        title: uiData.title,
+        palettePrimaryMain: getPrimaryMainColor(uiData.palettePrimaryMain),
+        palettePrimaryDark: getPrimaryDarkColor(uiData.palettePrimaryDark),
+        palettePrimaryLight: getPrimaryLightColor(uiData.palettePrimaryLight),
+        'logo.svgData': uiData.logoSvgData,
       };
       await updateConfig(input);
       enqueueSnackbar(formatMessage('userInterfacePage.successfullyUpdated'), {
@@ -66,6 +68,7 @@ export default function UserInterface() {
       throw new Error('Failed while updating!');
     }
   };
+
   return (
     <Container sx={{ py: 3, display: 'flex', justifyContent: 'center' }}>
       <Grid container item xs={12} sm={10} md={9}>
@@ -96,7 +99,7 @@ export default function UserInterface() {
                 />
 
                 <ColorInput
-                  name="palette.primary.main"
+                  name="palettePrimaryMain"
                   label={formatMessage(
                     'userInterfacePage.primaryMainColorFieldLabel',
                   )}
@@ -105,7 +108,7 @@ export default function UserInterface() {
                 />
 
                 <ColorInput
-                  name="palette.primary.dark"
+                  name="palettePrimaryDark"
                   label={formatMessage(
                     'userInterfacePage.primaryDarkColorFieldLabel',
                   )}
@@ -114,7 +117,7 @@ export default function UserInterface() {
                 />
 
                 <ColorInput
-                  name="palette.primary.light"
+                  name="palettePrimaryLight"
                   label={formatMessage(
                     'userInterfacePage.primaryLightColorFieldLabel',
                   )}
@@ -123,7 +126,7 @@ export default function UserInterface() {
                 />
 
                 <TextField
-                  name="logo.svgData"
+                  name="logoSvgData"
                   label={formatMessage('userInterfacePage.svgDataFieldLabel')}
                   multiline
                   fullWidth