fix: coverImage checking before trying to convert

src/interface/SettingsContext.tsx

@@ -24,7 +24,7 @@ export const SettingsContextProvider: React.FC<{ children: ReactNode }> = ({ chi
     shortcuts: [],
     customshortcuts: [],
     transparencyEffects: false,
-    theme: ""
+    selectedTheme: ''
   });
 
   const [showPicker, setShowPicker] = useState<boolean>(false);

src/interface/hooks/ThemeManagment.ts

@@ -97,7 +97,7 @@ export const sendThemeUpdate = (updatedTheme: CustomTheme, saveTheme?: boolean,
       CustomImages: imageData,
     };
 
-    if (saveTheme) {
+    if (saveTheme && updatedTheme.coverImage instanceof Blob) {
       themeData.coverImage = await blobToBase64(updatedTheme.coverImage as Blob);
     } else {
       themeData.coverImage = null;