diff --git a/NETGenerator/NETGenerator.cs b/NETGenerator/NETGenerator.cs
index 0843ecea9..62c4ed03b 100644
--- a/NETGenerator/NETGenerator.cs
+++ b/NETGenerator/NETGenerator.cs
@@ -5433,8 +5433,9 @@ namespace PascalABCCompiler.NETGenerator
                     {
                         if (lb.LocalType.IsGenericParameter)
                         {
-                            il.Emit(OpCodes.Ldloc, lb);
-                            il.Emit(OpCodes.Box, lb.LocalType);
+                            //il.Emit(OpCodes.Ldloc, lb);
+                            //il.Emit(OpCodes.Box, lb.LocalType);
+                            il.Emit(OpCodes.Ldloca, lb); // #1986
                         }
                         else
                             if (lb.LocalType.IsValueType)
diff --git a/TestSuite/where8.pas b/TestSuite/where8.pas
new file mode 100644
index 000000000..2dcfd08b8
--- /dev/null
+++ b/TestSuite/where8.pas
@@ -0,0 +1,28 @@
+type
+  t0 = abstract class
+    function f0: integer; abstract;
+  end;
+  t1 = class(t0)
+    i: integer;
+    function f0: integer; override := i;
+    constructor(i: integer) := self.i := i;
+  end;
+
+function f1<T>: T;
+where T: t0;
+begin
+  
+  Result := T(t0(
+    new t1(10)
+  ));
+  
+  Result.f0.Println; // до #1986 было AccessViolationException
+  
+end;
+
+begin
+  
+  f1&<t1>;
+  
+//  readln;
+end.
\ No newline at end of file
diff --git a/TestSuite/where9.pas b/TestSuite/where9.pas
new file mode 100644
index 000000000..33ff6faf4
--- /dev/null
+++ b/TestSuite/where9.pas
@@ -0,0 +1,18 @@
+function f1<TArray>: TArray;
+where TArray: System.Array;
+begin
+  
+  Result := TArray(System.Array(
+    new integer[10]
+  ));
+  
+  Result.Length.Println; // до #1986 выводило 107, не зависимо от массива выше
+  
+end;
+
+begin
+  
+  f1&<array of integer>;
+  
+//  readln;
+end.
\ No newline at end of file