diff --git a/dist/api/platform_config.php b/dist/api/platform_config.php
index 86cc3dd..17a5f59 100644
--- a/dist/api/platform_config.php
+++ b/dist/api/platform_config.php
@@ -8,6 +8,7 @@ require __DIR__ . '/im_web_bootstrap.php';
 
 $defaultName = 'Web IM';
 $defaultLogo = '/img/logo.ico';
+$legacyDefaultLogo = '/img/5IuOieu9PF8MJtp43kD2kCkdLVjVwDp7.ico';
 
 try {
     $statement = imAppDb()->prepare(
@@ -24,6 +25,9 @@ try {
 
     $platformName = $config['PlatformName'] ?? '';
     $logo = $config['sys_logo'] ?? '';
+    if (strcasecmp($logo, $legacyDefaultLogo) === 0) {
+        $logo = '';
+    }
     $version = implode('|', array_values(array_filter($updatedAtValues ?? [])));
 
     respond(0, 'success', [
diff --git a/public/api/platform_config.php b/public/api/platform_config.php
index 86cc3dd..17a5f59 100644
--- a/public/api/platform_config.php
+++ b/public/api/platform_config.php
@@ -8,6 +8,7 @@ require __DIR__ . '/im_web_bootstrap.php';
 
 $defaultName = 'Web IM';
 $defaultLogo = '/img/logo.ico';
+$legacyDefaultLogo = '/img/5IuOieu9PF8MJtp43kD2kCkdLVjVwDp7.ico';
 
 try {
     $statement = imAppDb()->prepare(
@@ -24,6 +25,9 @@ try {
 
     $platformName = $config['PlatformName'] ?? '';
     $logo = $config['sys_logo'] ?? '';
+    if (strcasecmp($logo, $legacyDefaultLogo) === 0) {
+        $logo = '';
+    }
     $version = implode('|', array_values(array_filter($updatedAtValues ?? [])));
 
     respond(0, 'success', [