diff --git a/TURN.Services.Chess/DBModel/ModelBaseContext.cs b/TURN.Services.Chess/DBModel/ModelBaseContext.cs
index 50affaf..77b4fe6 100644
--- a/TURN.Services.Chess/DBModel/ModelBaseContext.cs
+++ b/TURN.Services.Chess/DBModel/ModelBaseContext.cs
@@ -19,7 +19,7 @@ namespace TURN.Services.Chess.DBModel
         {
             try
             {
-                _ = Environment.GetEnvironmentVariable("DB") != null
+                _ = !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("DB"))
                     ? optionsBuilder.UseNpgsql(Environment.GetEnvironmentVariable("DB"))
                     : optionsBuilder.UseNpgsql("Server=localhost;Port=5432;Database=TURNChess;UserId=postgres;" +
                         "Password=example;");