diff --git a/AsbCloudInfrastructure/ReportDataSourcePgCloud.cs b/AsbCloudInfrastructure/ReportDataSourcePgCloud.cs
index f85a3108..c32f426d 100644
--- a/AsbCloudInfrastructure/ReportDataSourcePgCloud.cs
+++ b/AsbCloudInfrastructure/ReportDataSourcePgCloud.cs
@@ -8,6 +8,7 @@ using System.Linq;
 
 namespace AsbCloudInfrastructure
 {
+#nullable enable
     public class ReportDataSourcePgCloud : IReportDataSource
     {
         private readonly IAsbCloudDbContext context;
@@ -37,6 +38,9 @@ namespace AsbCloudInfrastructure
                 .Include(w => w.Telemetry)
                 .FirstOrDefault(w => w.Id == idWell);
 
+            if(well is null)
+                throw new ArgumentInvalidException("idWell doesn`t exist", nameof(idWell));
+
             idTelemetry = well?.IdTelemetry;
             if (idTelemetry is null)
                 throw new ArgumentInvalidException($"Well {idWell} doesn't contain telemetry", nameof(idWell));
@@ -49,7 +53,7 @@ namespace AsbCloudInfrastructure
                 .Where(u => u.IdTelemetry == idTelemetry)
                 .ToDictionary(u => u.IdUser, u => u);
 
-            timezoneOffset = well?.Telemetry?.Info?.TimeZoneOffsetTotalHours ?? well.Timezone?.Hours ?? 5.0;
+            timezoneOffset = well?.Telemetry?.Info?.TimeZoneOffsetTotalHours ?? well!.Timezone?.Hours ?? 5.0;
 
             info = new WellInfoReport
             {
@@ -155,4 +159,5 @@ namespace AsbCloudInfrastructure
         public WellInfoReport GetWellInfo()
         => info;
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Startup.cs b/AsbCloudInfrastructure/Startup.cs
index e93dc5e5..4ffdcf2f 100644
--- a/AsbCloudInfrastructure/Startup.cs
+++ b/AsbCloudInfrastructure/Startup.cs
@@ -13,6 +13,7 @@ using AsbCloudInfrastructure.Background;
 
 namespace AsbCloudInfrastructure
 {
+#nullable enable
     public class Startup
     {
         public static void BeforeRunHandler(IHost host)
@@ -20,7 +21,7 @@ namespace AsbCloudInfrastructure
             using var scope = host.Services.CreateScope();
             var provider = scope.ServiceProvider;
 
-            var context = provider.GetService<IAsbCloudDbContext>();
+            var context = provider.GetRequiredService<IAsbCloudDbContext>();
             context.Database.SetCommandTimeout(TimeSpan.FromSeconds(2 * 60));
             context.Database.Migrate();
 
@@ -70,4 +71,5 @@ namespace AsbCloudInfrastructure
             return bytes.ToString("### ### ###");
         }
     }
+#nullable disable
 }