diff --git a/packages/xod-fs/src/convertTypes.js b/packages/xod-fs/src/convertTypes.js
index f60b3814..4ebcbb14 100644
--- a/packages/xod-fs/src/convertTypes.js
+++ b/packages/xod-fs/src/convertTypes.js
@@ -45,3 +45,22 @@ export const convertPatchFileContentsToPatch = def(
     XP.createPatch
   )()
 );
+
+const optionalPatchFields = {
+  nodes: [],
+  links: [],
+  description: '',
+};
+
+const optionalNodeFields = {
+  boundValues: {},
+  label: '',
+  description: '',
+};
+
+export const addMissingOptionsToPatchFileContents = R.compose(
+  R.evolve({
+    nodes: R.map(R.merge(optionalNodeFields)),
+  }),
+  R.merge(optionalPatchFields)
+);
diff --git a/packages/xod-fs/src/load.js b/packages/xod-fs/src/load.js
index ab7a6caa..eef668ac 100644
--- a/packages/xod-fs/src/load.js
+++ b/packages/xod-fs/src/load.js
@@ -20,7 +20,10 @@ import {
 } from './utils';
 import { loadAttachments } from './attachments';
 import { loadPatchImpls } from './impls';
-import { convertPatchFileContentsToPatch } from './convertTypes';
+import {
+  convertPatchFileContentsToPatch,
+  addMissingOptionsToPatchFileContents,
+} from './convertTypes';
 // =============================================================================
 //
 // Reading of files
@@ -83,6 +86,7 @@ const readXodFile = projectPath => xodfile =>
             loadPatchImpls(dir),
             R.assoc('path', XP.getLocalPath(getPatchName(xodfile))),
             convertPatchFileContentsToPatch,
+            addMissingOptionsToPatchFileContents,
             Promise.resolve.bind(Promise)
           )(patch)
         ),
diff --git a/packages/xod-fs/src/loadLibs.js b/packages/xod-fs/src/loadLibs.js
index 00e92abf..506628c9 100644
--- a/packages/xod-fs/src/loadLibs.js
+++ b/packages/xod-fs/src/loadLibs.js
@@ -10,7 +10,10 @@ import {
 } from './utils';
 import { loadAttachments } from './attachments';
 import { loadPatchImpls } from './impls';
-import { convertPatchFileContentsToPatch } from './convertTypes';
+import {
+  convertPatchFileContentsToPatch,
+  addMissingOptionsToPatchFileContents,
+} from './convertTypes';
 
 const scanLibsFolder = (libs, libsDir) => Promise.all(
   libs.map(
@@ -39,6 +42,7 @@ const readLibFiles = (libfiles) => {
           loadPatchImpls(path.dirname(patchPath)),
           R.assoc('path', `${name}/${getPatchName(patchPath)}`),
           convertPatchFileContentsToPatch,
+          addMissingOptionsToPatchFileContents,
           readJSON
         )(patchPath)
       )
diff --git a/packages/xod-fs/test/backup.spec.js b/packages/xod-fs/test/backup.spec.js
index b3b1a997..73a137f9 100644
--- a/packages/xod-fs/test/backup.spec.js
+++ b/packages/xod-fs/test/backup.spec.js
@@ -21,7 +21,7 @@ describe('Backup', () => {
     backup.make()
       .then(() => readDir(tempPath))
       .then((files) => {
-        expect(files).to.have.lengthOf(6);
+        expect(files).to.have.lengthOf(7);
         done();
       })
       .catch(err => done(err));
diff --git a/packages/xod-fs/test/fixtures/libs.json b/packages/xod-fs/test/fixtures/libs.json
index efbe6117..f4addc01 100644
--- a/packages/xod-fs/test/fixtures/libs.json
+++ b/packages/xod-fs/test/fixtures/libs.json
@@ -165,6 +165,34 @@
     "path": "user/utils/test",
     "attachments": []
   },
+  "user/with-omitted-optionals/empty-lib-patch": {
+    "attachments": [],
+    "description": "",
+    "impls": {},
+    "links": {},
+    "nodes": {},
+    "path": "user/with-omitted-optionals/empty-lib-patch"
+  },
+  "user/with-omitted-optionals/optional-node-fields-omitted": {
+    "attachments": [],
+    "description": "",
+    "impls": {},
+    "links": {},
+    "nodes": {
+      "5c03e488-fefd-4f12-gq6a-78d209d9148c": {
+        "boundValues": {},
+        "description": "",
+        "id": "5c03e488-fefd-4f12-gq6a-78d209d9148c",
+        "label": "",
+        "position": {
+          "x": 292,
+          "y": 182
+        },
+        "type": "xod/core/pot"
+      }
+    },
+    "path": "user/with-omitted-optionals/optional-node-fields-omitted"
+  },
   "xod/math/test": {
     "description": "",
     "impls": {},
diff --git a/packages/xod-fs/test/fixtures/unpacked.json b/packages/xod-fs/test/fixtures/unpacked.json
index 6bba610a..0901a214 100644
--- a/packages/xod-fs/test/fixtures/unpacked.json
+++ b/packages/xod-fs/test/fixtures/unpacked.json
@@ -1,4 +1,15 @@
 [
+  {
+    "path": "./awesome-project/empty-local-patch/patch.xodp",
+    "content": {
+      "description": "",
+      "impls": {},
+      "links": {},
+      "nodes": {},
+      "path": "@/empty-local-patch",
+      "attachments": []
+    }
+  },
   {
     "path": "./awesome-project/project.xod",
     "content": {
diff --git a/packages/xod-fs/test/fixtures/workspace/awesome-project/empty-local-patch/patch.xodp b/packages/xod-fs/test/fixtures/workspace/awesome-project/empty-local-patch/patch.xodp
new file mode 100644
index 00000000..9e26dfee
--- /dev/null
+++ b/packages/xod-fs/test/fixtures/workspace/awesome-project/empty-local-patch/patch.xodp
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/empty-lib-patch/patch.xodp b/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/empty-lib-patch/patch.xodp
new file mode 100644
index 00000000..9e26dfee
--- /dev/null
+++ b/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/empty-lib-patch/patch.xodp
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/optional-node-fields-omitted/patch.xodp b/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/optional-node-fields-omitted/patch.xodp
new file mode 100644
index 00000000..606b65a0
--- /dev/null
+++ b/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/optional-node-fields-omitted/patch.xodp
@@ -0,0 +1,12 @@
+{
+  "nodes": [
+    {
+      "id": "5c03e488-fefd-4f12-gq6a-78d209d9148c",
+      "type": "xod/core/pot",
+      "position": {
+        "x": 292,
+        "y": 182
+      }
+    }
+  ]
+}
diff --git a/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/project.xod b/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/project.xod
new file mode 100644
index 00000000..4d0805b3
--- /dev/null
+++ b/packages/xod-fs/test/fixtures/workspace/lib/user/with-omitted-optionals/project.xod
@@ -0,0 +1,5 @@
+{
+  "name": "utils",
+  "authors": ["user"],
+  "version": "0.0.1"
+}
diff --git a/packages/xod-fs/test/fixtures/xodball.json b/packages/xod-fs/test/fixtures/xodball.json
index ce09fbc5..1f2bb55d 100644
--- a/packages/xod-fs/test/fixtures/xodball.json
+++ b/packages/xod-fs/test/fixtures/xodball.json
@@ -173,6 +173,34 @@
       "path": "user/utils/test",
       "attachments": []
     },
+    "user/with-omitted-optionals/empty-lib-patch": {
+      "attachments": [],
+      "description": "",
+      "impls": {},
+      "links": {},
+      "nodes": {},
+      "path": "user/with-omitted-optionals/empty-lib-patch"
+    },
+    "user/with-omitted-optionals/optional-node-fields-omitted": {
+      "attachments": [],
+      "description": "",
+      "impls": {},
+      "links": {},
+      "nodes": {
+        "5c03e488-fefd-4f12-gq6a-78d209d9148c": {
+          "boundValues": {},
+          "description": "",
+          "id": "5c03e488-fefd-4f12-gq6a-78d209d9148c",
+          "label": "",
+          "position": {
+            "x": 292,
+            "y": 182
+          },
+          "type": "xod/core/pot"
+        }
+      },
+      "path": "user/with-omitted-optionals/optional-node-fields-omitted"
+    },
     "xod/math/test": {
       "description": "",
       "impls": {},
@@ -181,6 +209,14 @@
       "path": "xod/math/test",
       "attachments": []
     },
+    "@/empty-local-patch": {
+      "attachments": [],
+      "description": "",
+      "impls": {},
+      "links": {},
+      "nodes": {},
+      "path": "@/empty-local-patch"
+    },
     "@/main": {
       "nodes": {
         "2c03e470-fefd-4f58-be6a-58d209d9158c": {
diff --git a/packages/xod-fs/test/load.spec.js b/packages/xod-fs/test/load.spec.js
index be84144d..33dc4373 100644
--- a/packages/xod-fs/test/load.spec.js
+++ b/packages/xod-fs/test/load.spec.js
@@ -50,7 +50,7 @@ describe('Loader', () => {
   it('getProjects: return an array of projects in workspace, including libs', () =>
     Loader.getProjects(workspace)
       .then((projects) => {
-        expect(projects).to.have.lengthOf(4);
+        expect(projects).to.have.lengthOf(5);
       })
   );
   it('getProjects: reject CANT_ENUMERATE_PROJECTS for non-existent workspace',
diff --git a/packages/xod-fs/test/loadLibs.spec.js b/packages/xod-fs/test/loadLibs.spec.js
index 130e5321..7d33a5ab 100644
--- a/packages/xod-fs/test/loadLibs.spec.js
+++ b/packages/xod-fs/test/loadLibs.spec.js
@@ -11,7 +11,15 @@ describe('Library loader', () => {
   const workspace = path.resolve(__dirname, workspaceDir);
 
   it('should load xod/core libs from ./fixtures/workspace/lib', (done) => {
-    const coreLibsOnly = R.omit(['user/utils/test', 'xod/math/test'], libsFixture);
+    const coreLibsOnly = R.omit(
+      [
+        'user/utils/test',
+        'user/with-omitted-optionals/empty-lib-patch',
+        'user/with-omitted-optionals/optional-node-fields-omitted',
+        'xod/math/test',
+      ],
+      libsFixture
+    );
     const nodeTypes = Object.assign({}, coreLibsOnly);
     delete nodeTypes['@/qux']; // lib loader don't know anything about patch nodes!
 
@@ -28,6 +36,8 @@ describe('Library loader', () => {
       .then((data) => {
         expect(data).to.have.keys([
           'user/utils/test',
+          'user/with-omitted-optionals/empty-lib-patch',
+          'user/with-omitted-optionals/optional-node-fields-omitted',
           'xod/core/and',
           'xod/core/led',
           'xod/core/pot',
diff --git a/packages/xod-fs/test/save.spec.js b/packages/xod-fs/test/save.spec.js
index cc02f961..1a6d87f7 100644
--- a/packages/xod-fs/test/save.spec.js
+++ b/packages/xod-fs/test/save.spec.js
@@ -53,14 +53,15 @@ describe('saveArrangedFiles', () => {
 
   it('should save an extracted project into temp directory', (done) => {
     const dataToSave = arrangeByFiles(xodball);
+    const expectedFilesNumber = 7;
 
     const onFinish = () => {
       try {
         recReadDir(workspacePath, ['.DS_Store', 'Thumbs.db'], (err, files) => {
-          if (files.length === 6) {
+          if (files.length === expectedFilesNumber) {
             done();
           } else {
-            throw new Error('Wrong amount of files (not equal 5). Check .xodball or change amount in the test!');
+            throw new Error(`Wrong amount of files (not equal ${expectedFilesNumber}). Check .xodball or change amount in the test!`);
           }
         });
       } catch (err) {