diff --git a/packages/xod-arduino/src/transpiler.js b/packages/xod-arduino/src/transpiler.js
index a48e5a6b..09dd79df 100644
--- a/packages/xod-arduino/src/transpiler.js
+++ b/packages/xod-arduino/src/transpiler.js
@@ -46,6 +46,7 @@ const kebabToSnake = R.replace(/-/g, '_');
 const createPatchNames = def(
   'createPatchNames :: PatchPath -> { owner :: String, libName :: String, patchName :: String }',
   (path) => {
+    // TODO: this handles @/local-patches incorrectly
     const [owner, libName, ...patchNameParts] = R.split('/', path);
     const patchName = patchNameParts.join('/');
 
@@ -194,7 +195,7 @@ const getPinLabelsMap = def(
 );
 
 const getNodePinsUnsafe = def(
-  'getNodePinLabels :: Node -> Project -> [Pin]',
+  'getNodePinsUnsafe :: Node -> Project -> [Pin]',
   (node, project) => R.compose(
     explodeMaybe(`Can’t get node pins of node ${node}. Referred type missing?`),
     Project.getNodePins
@@ -349,6 +350,19 @@ const createTNodes = def(
 export const transformProject = def(
   'transformProject :: [Source] -> Project -> PatchPath -> Either Error TProject',
   (impls, project, path) => R.compose(
+    R.chain((tProject) => {
+      const nodeWithTooManyOutputs = R.find(
+        R.pipe(R.prop('outputs'), R.length, R.lte(7)),
+        tProject.patches
+      );
+
+      if (nodeWithTooManyOutputs) {
+        const { owner, libName, patchName } = nodeWithTooManyOutputs;
+        return Either.Left(new Error(`Native node ${owner}/${libName}/${patchName} has more than 7 outputs`));
+      }
+
+      return Either.of(tProject);
+    }),
     R.map(([proj, topology]) => {
       const patches = createTPatches(path, proj);
 
diff --git a/packages/xod-arduino/test/mocha.opts b/packages/xod-arduino/test/mocha.opts
index cd47db09..a692071a 100644
--- a/packages/xod-arduino/test/mocha.opts
+++ b/packages/xod-arduino/test/mocha.opts
@@ -1,4 +1,4 @@
 --require babel-register
 --colors
---timeout 120000
+--timeout 240000
 --plugins babel-plugin-inline-import
diff --git a/packages/xod-arduino/test/transpiler.spec.js b/packages/xod-arduino/test/transpiler.spec.js
index 4d03af7f..2372dfa2 100644
--- a/packages/xod-arduino/test/transpiler.spec.js
+++ b/packages/xod-arduino/test/transpiler.spec.js
@@ -3,7 +3,7 @@ import path from 'path';
 import R from 'ramda';
 import { assert } from 'chai';
 
-import { explode } from 'xod-func-tools';
+import { explode, foldEither } from 'xod-func-tools';
 import { loadProject } from 'xod-fs';
 import { PIN_TYPE } from 'xod-project';
 import { defaultizePin } from 'xod-project/test/helpers';
@@ -35,6 +35,19 @@ describe('xod-arduino transpiler', () => {
         .then(transpile(R.__, '@/non-existing-patch'))
         .then(result => assert.ok(result.isLeft))
   );
+
+  it('returns error if some native node has more than 7 outputs',
+    () =>
+      loadProject(wsPath('faulty'))
+        .then(transpile(R.__, '@/too-many-outputs-main'))
+        .then(foldEither(
+          (err) => {
+            assert.include(err.message, '@/too_many_outputs');
+            assert.include(err.message, 'has more than 7 outputs');
+          },
+          () => assert.fail('expecting Either.Left')
+        ))
+  );
 });
 
 describe('getInitialDirtyFlags', () => {
diff --git a/packages/xod-client-electron/test-func/fixtures/blink.cpp b/packages/xod-client-electron/test-func/fixtures/blink.cpp
index 87d510d5..1e4f7ce3 100644
--- a/packages/xod-client-electron/test-func/fixtures/blink.cpp
+++ b/packages/xod-client-electron/test-func/fixtures/blink.cpp
@@ -1136,11 +1136,11 @@ namespace xod {
     };
 
     DirtyFlags dirtyFlags[NODE_COUNT] = {
-        DirtyFlags(-1),
-        DirtyFlags(-1),
-        DirtyFlags(-1),
-        DirtyFlags(-1),
-        DirtyFlags(-1)
+        DirtyFlags(253),
+        DirtyFlags(255),
+        DirtyFlags(255),
+        DirtyFlags(255),
+        DirtyFlags(255)
     };
 
     NodeId topology[NODE_COUNT] = {
diff --git a/workspace/faulty/project.xod b/workspace/faulty/project.xod
new file mode 100644
index 00000000..549ea25a
--- /dev/null
+++ b/workspace/faulty/project.xod
@@ -0,0 +1,3 @@
+{
+  "name": "faulty"
+}
\ No newline at end of file
diff --git a/workspace/faulty/too-many-outputs-main/patch.xodp b/workspace/faulty/too-many-outputs-main/patch.xodp
new file mode 100644
index 00000000..c6388689
--- /dev/null
+++ b/workspace/faulty/too-many-outputs-main/patch.xodp
@@ -0,0 +1,12 @@
+{
+  "nodes": [
+    {
+      "id": "Bk-49Oyw-",
+      "position": {
+        "x": 138,
+        "y": 120
+      },
+      "type": "@/too-many-outputs"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/workspace/faulty/too-many-outputs/any.cpp b/workspace/faulty/too-many-outputs/any.cpp
new file mode 100644
index 00000000..31fac8b7
--- /dev/null
+++ b/workspace/faulty/too-many-outputs/any.cpp
@@ -0,0 +1 @@
+// it shoud not transpile anyway
diff --git a/workspace/faulty/too-many-outputs/patch.xodp b/workspace/faulty/too-many-outputs/patch.xodp
new file mode 100644
index 00000000..0bbff884
--- /dev/null
+++ b/workspace/faulty/too-many-outputs/patch.xodp
@@ -0,0 +1,76 @@
+{
+  "nodes": [
+    {
+      "id": "Bkby9_1vb",
+      "position": {
+        "x": 138,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-number"
+    },
+    {
+      "id": "H14e5uyDZ",
+      "position": {
+        "x": 778,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-pulse"
+    },
+    {
+      "id": "Hy0CF_kDW",
+      "position": {
+        "x": 10,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-boolean"
+    },
+    {
+      "id": "S1N1cdJDW",
+      "position": {
+        "x": 266,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-pulse"
+    },
+    {
+      "id": "SJ_e9uJvZ",
+      "position": {
+        "x": 906,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-string"
+    },
+    {
+      "id": "SkhkcdyDb",
+      "position": {
+        "x": 522,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-boolean"
+    },
+    {
+      "id": "rJ4ZcukDb",
+      "position": {
+        "x": 10,
+        "y": 16
+      },
+      "type": "xod/patch-nodes/not-implemented-in-xod"
+    },
+    {
+      "id": "rkO1quyPW",
+      "position": {
+        "x": 394,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-string"
+    },
+    {
+      "id": "rkbl5dyPb",
+      "position": {
+        "x": 650,
+        "y": 224
+      },
+      "type": "xod/patch-nodes/output-number"
+    }
+  ]
+}
\ No newline at end of file