When using .Include against a nullable FK, mapping to the dynamic result causes an exception. Added a guard to ensure dynamic mapping no longer fails when running across a FK that is null.

Author: User00015

SqlKata.Execution/QueryFactory.cs

@@ -749,8 +749,8 @@ private static IEnumerable<T> handleIncludes<T>(Query query, IEnumerable<T> resu
 
                 foreach (var item in dynamicResult)
                 {
-                    var foreignValue = item[include.ForeignKey].ToString();
-                    item[include.Name] = related.ContainsKey(foreignValue) ? related[foreignValue] : null;
+                    var foreignValue = item[include.ForeignKey]?.ToString();
+                    item[include.Name] = foreignValue != null && related.ContainsKey(foreignValue) ? related[foreignValue] : null;
                 }
             }