added check for null EntityType

.gitignore

@@ -19,3 +19,5 @@
 *.user
 /Tanneryd.BulkOperations.EF6/Tanneryd.BulkOperations.EF6.Tests/EF/StebbingContext.cs
 Tanneryd.BulkOperations.EF6/Tanneryd.BulkOperations.EF6.NetStd/nuget_api.txt
+/Tanneryd.BulkOperations.EF6/issue-31-reproduction/bin/Debug
+/Tanneryd.BulkOperations.EF6/issue-31-reproduction/obj

Tanneryd.BulkOperations.EF6/Tanneryd.BulkOperations.EF6.sln

@@ -7,6 +7,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Tanneryd.BulkOperations.EF6
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Tanneryd.BulkOperations.EF6.Tests", "Tanneryd.BulkOperations.EF6.Tests\Tanneryd.BulkOperations.EF6.Tests.csproj", "{82605BC1-B02B-4ED6-94E0-864D673BAEE9}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "issue-31-reproduction", "issue-31-reproduction\issue-31-reproduction.csproj", "{815A6214-68DF-48E0-8DC8-3446AB939634}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -21,6 +23,10 @@ Global
 		{82605BC1-B02B-4ED6-94E0-864D673BAEE9}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{82605BC1-B02B-4ED6-94E0-864D673BAEE9}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{82605BC1-B02B-4ED6-94E0-864D673BAEE9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{815A6214-68DF-48E0-8DC8-3446AB939634}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{815A6214-68DF-48E0-8DC8-3446AB939634}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{815A6214-68DF-48E0-8DC8-3446AB939634}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{815A6214-68DF-48E0-8DC8-3446AB939634}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Tanneryd.BulkOperations.EF6/Tanneryd.BulkOperations.EF6/DbContextExtensions.cs

@@ -2316,11 +2316,12 @@ private static Mappings GetMappings(DbContext ctx, Type t)
             //
             var foreignKeyMappings = new List<ForeignKeyMapping>();
             var navigationProperties =
-                typeMapping.EntityType.DeclaredMembers
-                    .Where(m => m.BuiltInTypeKind == BuiltInTypeKind.NavigationProperty)
-                    .Cast<NavigationProperty>()
-                    .Where(p => p.RelationshipType is AssociationType)
-                    .ToArray();
+	            typeMapping.EntityType
+		            .DeclaredMembers
+		            .Where(m => m.BuiltInTypeKind == BuiltInTypeKind.NavigationProperty)
+		            .Cast<NavigationProperty>()
+		            .Where(p => p.RelationshipType is AssociationType)
+		            .ToArray();
 
             foreach (var navigationProperty in navigationProperties)
             {

Tanneryd.BulkOperations.EF6/issue-31-reproduction/App.config

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <configSections>
+    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
+    <section name="entityFramework"
+             type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
+             requirePermission="false"/>
+  </configSections>
+    <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
+  </startup>
+  <entityFramework>
+      <providers>
+        <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer"/>
+      </providers>
+    </entityFramework>
+</configuration>
+

Tanneryd.BulkOperations.EF6/issue-31-reproduction/Program.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+using System.Data.SqlClient;
+using System.Linq;
+using issue_31_reproduction.dbmodel;
+using Tanneryd.BulkOperations.EF6.NetStd;
+
+namespace issue_31_reproduction
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			try
+			{
+				string dbName = "issue31repro";
+				string dataSource = "(localdb)\\MSSQLLocalDB";
+				//string dataSource = "localhost\\SQLEXPRESS";
+
+				string connStrFormat = $"Data Source={dataSource};Initial Catalog={{0}};Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
+				EnsureLocalDb(connStrFormat, dbName);
+				var dbModel = new DbModelContainer($"metadata=res://*/dbmodel.DbModel.csdl|res://*/dbmodel.DbModel.ssdl|res://*/dbmodel.DbModel.msl;provider=System.Data.SqlClient;provider connection string='{string.Format(connStrFormat, dbName)}'");
+				var logItems = new List<LogItem>()
+				{
+					CreateLogItemInstance(),
+					CreateLogItemInstance(),
+					CreateLogItemInstance()
+				};
+				Console.WriteLine($"Before bulk insert - Table Log contains {dbModel.Log.Count()} items");
+				dbModel.BulkInsertAll(logItems);
+				Console.WriteLine($"After bulk insert - Table Log contains {dbModel.Log.Count()} items");
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine(ex);
+			}
+
+			Console.WriteLine("Press any key to exit...");
+			Console.ReadKey();
+		}
+
+		static void EnsureLocalDb(string connStringFormat, string dbName)
+		{
+			ExecQuery(string.Format(connStringFormat, "master"), $"If(db_id(N'{dbName}') IS NULL) BEGIN CREATE DATABASE [{dbName}]; END; ");
+			ExecQuery(string.Format(connStringFormat, dbName), System.IO.File.ReadAllText("create_script.sql"));
+		}
+
+		static void ExecQuery(string connString, string query)
+		{
+			using (SqlConnection connection = new SqlConnection(
+				connString))
+			{
+				SqlCommand command = new SqlCommand(
+					query, connection);
+				connection.Open();
+				using (SqlDataReader reader = command.ExecuteReader())
+				{
+					while (reader.Read())
+					{
+						Console.WriteLine(String.Format("{0}, {1}",
+							reader[0], reader[1]));
+					}
+				}
+			}
+		}
+
+		static LogItem CreateLogItemInstance()
+		{
+			return new LogItem()
+			{
+				ConfigId = DateTime.UtcNow.Ticks,
+				Exception = "my exception",
+				Message = "my message",
+				CorrelationId = Guid.NewGuid(),
+				CrmUser = Guid.NewGuid(),
+				Date = DateTime.UtcNow,
+				EntityId = Guid.NewGuid(),
+				EntityLogicalName = "myentity",
+				Level = "DEBUG",
+				Logger = "Db integration test",
+				OrganizationId = Guid.NewGuid(),
+				SdkMessage = "TestMessage",
+				Thread = "1",
+				Id = 0
+			};
+		}
+	}
+}

Tanneryd.BulkOperations.EF6/issue-31-reproduction/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("issue-31-reproduction")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("issue-31-reproduction")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("815a6214-68df-48e0-8dc8-3446ab939634")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Tanneryd.BulkOperations.EF6/issue-31-reproduction/create_script.sql

@@ -0,0 +1,30 @@
+
+IF OBJECT_ID(N'[dbo].[Log]', 'U') IS NOT NULL
+    DROP TABLE [dbo].[Log];
+
+-- --------------------------------------------------
+-- Creating all tables
+-- --------------------------------------------------
+
+-- Creating table 'Log'
+CREATE TABLE [dbo].[Log] (
+    [Id] bigint IDENTITY(1,1) NOT NULL,
+    [Date] datetime  NOT NULL,
+    [Thread] nvarchar(255)  NOT NULL,
+    [Level] nvarchar(50)  NOT NULL,
+    [Logger] nvarchar(255)  NOT NULL,
+    [Message] nvarchar(4000)  NOT NULL,
+    [Exception] nvarchar(2000)  NULL,
+    [EntityId] uniqueidentifier  NULL,
+    [EntityLogicalName] nvarchar(100)  NULL,
+    [ConfigId] bigint  NOT NULL,
+    [SdkMessage] nvarchar(20)  NULL,
+    [CrmUser] uniqueidentifier  NULL,
+    [CorrelationId] uniqueidentifier  NULL,
+    [OrganizationId] uniqueidentifier  NULL
+);
+
+-- Creating primary key on [Id] in table 'Log'
+ALTER TABLE [dbo].[Log]
+ADD CONSTRAINT [PK_Log]
+    PRIMARY KEY CLUSTERED ([Id] ASC);