diff --git a/src/signal_association/coinmarketcap.rs b/src/signal_association/coinmarketcap.rs
index f09212a..7a90376 100644
--- a/src/signal_association/coinmarketcap.rs
+++ b/src/signal_association/coinmarketcap.rs
@@ -167,6 +167,10 @@ pub async fn market_cap_index() -> Result<(), Box<dyn std::error::Error + Send +
                     return Err("Err")?;
                 }
 
+                if v.as_object().unwrap().get("data").is_none() {
+                    return Err("Err")?;
+                }
+                
                 into_vec = v
                     .as_object()
                     .unwrap()