diff --git a/frontend/src/views/admin/orders/AdminPaymentPlansView.vue b/frontend/src/views/admin/orders/AdminPaymentPlansView.vue
index 1d1beaa938..f0ac6e69ce 100644
--- a/frontend/src/views/admin/orders/AdminPaymentPlansView.vue
+++ b/frontend/src/views/admin/orders/AdminPaymentPlansView.vue
@@ -78,11 +78,11 @@
             <label class="input-label">{{ t('payment.admin.group') }}</label>
             <Select v-model="planForm.group_id" :options="groupOptions" class="w-full">
               <template #selected="{ option }">
-                <span v-if="option?.platform" :class="platformTextClass(option.platform)">{{ option.label }}</span>
+                <span v-if="option?.platform" :class="platformTextClass(String(option.platform))">{{ option.label }}</span>
                 <span v-else>{{ option?.label || t('payment.admin.selectGroup') }}</span>
               </template>
               <template #option="{ option, selected }">
-                <span class="flex-1 truncate text-left" :class="option.platform ? platformTextClass(option.platform) : ''">{{ option.label }}</span>
+                <span class="flex-1 truncate text-left" :class="option.platform ? platformTextClass(String(option.platform)) : ''">{{ option.label }}</span>
                 <Icon v-if="selected" name="check" size="sm" class="text-primary-500" :stroke-width="2" />
               </template>
             </Select>