diff --git a/CHANGELOG.md b/CHANGELOG.md
index d63e7a7d..77d14c3c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 1.10.1
+
+### Node JS API
+
+* Don't crash when passing both `includePaths` and `importer`.
+
 ## 1.10.0
 
 * When two `@media` rules' queries can't be merged, leave nested rules in place
diff --git a/lib/src/node.dart b/lib/src/node.dart
index cf31f154..7667786e 100644
--- a/lib/src/node.dart
+++ b/lib/src/node.dart
@@ -259,7 +259,7 @@ NodeImporter _parseImporter(RenderOptions options, DateTime start) {
     importers = [options.importer as JSFunction];
   }
 
-  var includePaths = options.includePaths ?? [];
+  var includePaths = new List<String>.from(options.includePaths ?? []);
 
   RenderContext context;
   if (importers.isNotEmpty) {
diff --git a/lib/src/node/render_options.dart b/lib/src/node/render_options.dart
index 23832ebc..e362daa7 100644
--- a/lib/src/node/render_options.dart
+++ b/lib/src/node/render_options.dart
@@ -13,7 +13,7 @@ class RenderOptions {
   external String get data;
   external dynamic get importer;
   external dynamic get functions;
-  external List<String> get includePaths;
+  external List get includePaths; // contains Strings
   external bool get indentedSyntax;
   external bool get omitSourceMapUrl;
   external String get outFile;
diff --git a/lib/src/node/render_result.dart b/lib/src/node/render_result.dart
index b3764b0f..b26d2d57 100644
--- a/lib/src/node/render_result.dart
+++ b/lib/src/node/render_result.dart
@@ -24,7 +24,7 @@ class RenderResultStats {
   external int get start;
   external int get end;
   external int get duration;
-  external List<String> get includedFiles;
+  external List get includedFiles; // contains Strings
 
   external factory RenderResultStats(
       {String entry,
diff --git a/pubspec.yaml b/pubspec.yaml
index 82568d56..58d9676d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.10.0
+version: 1.10.1
 description: A Sass implementation in Dart.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/sass/dart-sass
diff --git a/test/node_api/utils.dart b/test/node_api/utils.dart
index cb5ad6dd..7c86821f 100644
--- a/test/node_api/utils.dart
+++ b/test/node_api/utils.dart
@@ -4,11 +4,13 @@
 
 import 'dart:async';
 import 'dart:convert';
+import 'dart:js_util';
 
 import 'package:js/js.dart';
 import 'package:test/test.dart';
 
 import 'package:sass/src/io.dart';
+import 'package:sass/src/node/function.dart';
 
 import '../hybrid.dart';
 import 'api.dart';
@@ -60,6 +62,18 @@ Future<RenderError> renderError(RenderOptions options) {
 String renderSync(RenderOptions options) =>
     utf8.decode(sass.renderSync(options).css);
 
+/// Like [renderSync], but goes through the untyped JS API.
+///
+/// This lets us test that we properly cast untyped collections without throwing
+/// type errors.
+String renderSyncJS(Map<String, Object> options) {
+  var result = _renderSyncJS.call(sass, jsify(options)) as RenderResult;
+  return utf8.decode(result.css);
+}
+
+final _renderSyncJS =
+    new JSFunction("sass", "args", "return sass.renderSync(args);");
+
 /// Asserts that rendering via [options] produces an error, and returns that
 /// error.
 RenderError renderSyncError(RenderOptions options) {
diff --git a/test/node_api_test.dart b/test/node_api_test.dart
index e522ffd6..d424f108 100644
--- a/test/node_api_test.dart
+++ b/test/node_api_test.dart
@@ -6,6 +6,7 @@
 @Tags(const ['node'])
 
 import 'dart:convert';
+import 'dart:js';
 
 import 'package:path/path.dart' as p;
 import 'package:test/test.dart';
@@ -420,6 +421,28 @@ a {
         });
       });
     });
+
+    group("when called with a raw JS collection", () {
+      test("for includePaths", () {
+        expect(
+            renderSyncJS({
+              "data": "@import 'test'",
+              "includePaths": [sandbox]
+            }),
+            equalsIgnoringWhitespace('a { b: c; }'));
+      });
+
+      // Regression test for #412
+      test("for includePaths with an importer", () {
+        expect(
+            renderSyncJS({
+              "data": "@import 'test'",
+              "includePaths": [sandbox],
+              "importer": allowInterop((url, prev) => null)
+            }),
+            equalsIgnoringWhitespace('a { b: c; }'));
+      });
+    });
   });
 
   group("render()", () {