diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47ac8f6..5b4cd55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [unreleased]
 
+## [1.0.3-dev.10] - 2018-07-09
+
+- fix error "Cannot read property push of undefined" when a resolver throws an exception
+- fix the resolver for an unknown extension
+
 ## [1.0.3-dev.9] - 2018-07-06
 
 - bug fix - on Linux module path (require('a.js')) is resolved as relative path (require('./a.js'))
diff --git a/package.json b/package.json
index 1418a8d..269c950 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bit-javascript",
-  "version": "1.0.3-dev.9",
+  "version": "1.0.3-dev.10",
   "scripts": {
     "flow": "flow; test $? -eq 0 -o $? -eq 2",
     "lint": "eslint src && flow check || true",
diff --git a/src/dependency-builder/build-tree.js b/src/dependency-builder/build-tree.js
index d07984a..4dbaa78 100644
--- a/src/dependency-builder/build-tree.js
+++ b/src/dependency-builder/build-tree.js
@@ -348,9 +348,8 @@ function mergeMissingToTree(missingGroups, tree: Tree) {
 function mergeErrorsToTree(baseDir, errors, tree: Tree) {
   if (R.isEmpty(errors)) return;
   Object.keys(errors).forEach((file) => {
-    const relativeFile = processPath(file, {}, baseDir);
-    if (tree[relativeFile]) tree[relativeFile].error = errors[file];
-    else tree[relativeFile] = { error: errors[file] };
+    if (tree[file]) tree[file].error = errors[file];
+    else tree[file] = { error: errors[file] };
   });
 }
 
@@ -361,13 +360,6 @@ function groupBySupportedFiles(filePaths: string[]) {
   return R.groupBy(supportCriteria, filePaths);
 }
 
-function mergeUnsupportedFilesToTree(baseDir, unsupportedFiles: string[], tree: Tree) {
-  unsupportedFiles.forEach((file) => {
-    const relativeFile = processPath(file, {}, baseDir);
-    tree[relativeFile] = {};
-  });
-}
-
 /**
  * Function for fetching dependency tree of file or dir
  * @param baseDir working directory
@@ -394,14 +386,13 @@ export async function getDependencyTree({
     resolveConfig: resolveConfigAbsolute
   };
   const { supportedFiles, unsupportedFiles } = groupBySupportedFiles(filePaths);
-  const { madgeTree, skipped, pathMap, errors } = generateTree(supportedFiles, config);
+  const { madgeTree, skipped, pathMap, errors } = generateTree(supportedFiles, unsupportedFiles, config);
   const tree: Tree = groupDependencyTree(madgeTree, baseDir, bindingPrefix);
   const { missingGroups, foundPackages } = groupMissing(skipped, baseDir, consumerPath, bindingPrefix);
 
   if (foundPackages) mergeManuallyFoundPackagesToTree(foundPackages, missingGroups, tree);
   if (errors) mergeErrorsToTree(baseDir, errors, tree);
   if (missingGroups) mergeMissingToTree(missingGroups, tree);
-  if (unsupportedFiles) mergeUnsupportedFilesToTree(baseDir, unsupportedFiles, tree);
   if (pathMap) updateTreeWithPathMap(tree, pathMap, baseDir);
 
   return { tree };
diff --git a/src/dependency-builder/filing-cabinet/index.js b/src/dependency-builder/filing-cabinet/index.js
index fd779cf..2eceff5 100644
--- a/src/dependency-builder/filing-cabinet/index.js
+++ b/src/dependency-builder/filing-cabinet/index.js
@@ -78,7 +78,8 @@ module.exports = function cabinet(options: Options) {
 
   const getResolverResults = () => {
     // old resolver are not getting an object parameter
-    if (resolver.name === 'resolveDependencyPath' || ext === '.styl') {
+    if (resolver.length > 1) {
+      // check whether the 'resolver' function gets more than one parameter
       // $FlowFixMe
       return resolver(partial, filename, directory);
     }
diff --git a/src/dependency-builder/filing-cabinet/index.spec.js b/src/dependency-builder/filing-cabinet/index.spec.js
index a1489cb..914417a 100644
--- a/src/dependency-builder/filing-cabinet/index.spec.js
+++ b/src/dependency-builder/filing-cabinet/index.spec.js
@@ -480,6 +480,18 @@ describe('filing-cabinet', () => {
     });
   });
 
+  describe('unrecognized extension', () => {
+    it('uses a generic resolve for unsupported file extensions', () => {
+      const result = cabinet({
+        partial: './bar',
+        filename: 'barbazim/foo.baz',
+        directory: 'barbazim/'
+      });
+
+      assert.equal(result, path.normalize(`${mockRootDir}/barbazim/bar.baz`));
+    });
+  });
+
   describe('.register', () => {
     it('registers a custom resolver for a given extension', () => {
       const stub = sinon.stub().returns('foo.foobar');
diff --git a/src/dependency-builder/generate-tree-madge.js b/src/dependency-builder/generate-tree-madge.js
index 30f1142..635e4ff 100644
--- a/src/dependency-builder/generate-tree-madge.js
+++ b/src/dependency-builder/generate-tree-madge.js
@@ -111,7 +111,7 @@ function convertTree(depTree, tree, pathCache, baseDir) {
  * @param config
  * @return {Object}
  */
-export default function generateTree(files = [], config) {
+export default function generateTree(files = [], unsupportedFiles = [], config) {
   const depTree = {};
   const visited = {};
   const nonExistent = {};
@@ -159,13 +159,28 @@ export default function generateTree(files = [], config) {
   });
 
   let tree = convertTree(depTree, {}, pathCache, config.baseDir);
-  for (const npmKey in npmPaths) {
-    const id = processPath(npmKey, pathCache, config.baseDir);
 
+  unsupportedFiles.forEach((file) => {
+    const relativeFile = processPath(file, pathCache, config.baseDir);
+    if (!tree[relativeFile]) tree[relativeFile] = [];
+  });
+
+  // rename errors keys from absolute paths to relative paths
+  Object.keys(errors).forEach((file) => {
+    const relativeFile = processPath(file, pathCache, config.baseDir);
+    if (relativeFile !== file) {
+      errors[relativeFile] = errors[file];
+      delete errors[file];
+    }
+  });
+
+  Object.keys(npmPaths).forEach((npmKey) => {
+    const id = processPath(npmKey, pathCache, config.baseDir);
+    if (!tree[id] && errors[id]) return; // if a file has errors, it won't be in the tree object but in the errors object
     npmPaths[npmKey].forEach((npmPath) => {
       tree[id].push(processPath(npmPath, pathCache, config.baseDir));
     });
-  }
+  });
 
   if (config.excludeRegExp) {
     tree = exclude(tree, config.excludeRegExp);