diff --git a/crypto/sol/app.py b/crypto/sol/app.py
index a25c369..438134a 100644
--- a/crypto/sol/app.py
+++ b/crypto/sol/app.py
@@ -797,8 +797,10 @@ async def list_initial_wallet_states():
     await save_token_info()
 
 def safe_get_property(info, property_name, default='Unknown'):
-    return info.get(property_name, default) if isinstance(info, dict) else default
-
+    if not isinstance(info, dict):
+        return str(default)
+    value = info.get(property_name, default)
+    return str(value) if value is not None else str(default)
 
 async def save_token_info():
     with open('./logs/token_info.json', 'w') as f: