Prevent no last candle error

src/Managing.Infrastructure.Web3/EvmManager.cs

@@ -498,6 +498,12 @@ public class EvmManager : IEvmManager
     {
         var lastCandles = await GetCandles(ticker, DateTime.UtcNow.AddMinutes(-5),
             Timeframe.OneMinute);
+        
+        if (lastCandles == null || !lastCandles.Any())
+        {
+            throw new InvalidOperationException($"No candles found for ticker {ticker}. Unable to get the latest candle data.");
+        }
+        
         return lastCandles.Last();
     }