Error of nil conversion from bson.D decoded using UnmarshalExtJSON

Author: roman.tarasov

bson/bsoncodec/default_value_encoders.go

@@ -309,12 +309,17 @@ func (dve DefaultValueEncoders) ArrayEncodeValue(ec EncodeContext, vw bsonrw.Val
 				return err
 			}
 
-			encoder, err := ec.LookupEncoder(reflect.TypeOf(e.Value))
+			ve := e.Value
+			if reflect.TypeOf(ve) == nil {
+				ve = primitive.Null{}
+			}
+
+			encoder, err := ec.LookupEncoder(reflect.TypeOf(ve))
 			if err != nil {
 				return err
 			}
 
-			err = encoder.EncodeValue(ec, vw, reflect.ValueOf(e.Value))
+			err = encoder.EncodeValue(ec, vw, reflect.ValueOf(ve))
 			if err != nil {
 				return err
 			}
@@ -372,12 +377,16 @@ func (dve DefaultValueEncoders) SliceEncodeValue(ec EncodeContext, vw bsonrw.Val
 				return err
 			}
 
-			encoder, err := ec.LookupEncoder(reflect.TypeOf(e.Value))
+			ve := e.Value
+			if reflect.TypeOf(ve) == nil {
+				ve = primitive.Null{}
+			}
+			encoder, err := ec.LookupEncoder(reflect.TypeOf(ve))
 			if err != nil {
 				return err
 			}
 
-			err = encoder.EncodeValue(ec, vw, reflect.ValueOf(e.Value))
+			err = encoder.EncodeValue(ec, vw, reflect.ValueOf(ve))
 			if err != nil {
 				return err
 			}

bson/bsoncodec/default_value_encoders_test.go

@@ -304,6 +304,14 @@ func TestDefaultValueEncoders(t *testing.T) {
 					bsonrwtest.WriteDocumentEnd,
 					nil,
 				},
+				{
+					"[1]primitive.E/success",
+					[1]primitive.E{{"hello", nil}},
+					&EncodeContext{Registry: buildDefaultRegistry()},
+					nil,
+					bsonrwtest.WriteDocumentEnd,
+					nil,
+				},
 			},
 		},
 		{
@@ -358,6 +366,14 @@ func TestDefaultValueEncoders(t *testing.T) {
 					bsonrwtest.WriteDocumentEnd,
 					nil,
 				},
+				{
+					"D/success",
+					primitive.D{{"hello", nil}},
+					&EncodeContext{Registry: buildDefaultRegistry()},
+					nil,
+					bsonrwtest.WriteDocumentEnd,
+					nil,
+				},
 			},
 		},
 		{