diff --git a/packages/sol-compiler/package.json b/packages/sol-compiler/package.json
index fcf9775c13..7eaff360f7 100644
--- a/packages/sol-compiler/package.json
+++ b/packages/sol-compiler/package.json
@@ -92,6 +92,7 @@
         "require-from-string": "^2.0.1",
         "semver": "5.5.0",
         "solc": "^0.4.23",
+        "source-map-support": "^0.5.0",
         "web3-eth-abi": "^1.0.0-beta.24",
         "yargs": "^10.0.3"
     },
diff --git a/packages/sol-compiler/src/cli.ts b/packages/sol-compiler/src/cli.ts
index 8901c0a31b..83dadc7ca5 100644
--- a/packages/sol-compiler/src/cli.ts
+++ b/packages/sol-compiler/src/cli.ts
@@ -3,6 +3,7 @@
 
 import { logUtils } from '@0xproject/utils';
 import * as _ from 'lodash';
+import 'source-map-support/register';
 import * as yargs from 'yargs';
 
 import { Compiler } from './compiler';
diff --git a/packages/sol-resolver/CHANGELOG.json b/packages/sol-resolver/CHANGELOG.json
index abce53d09c..dd9cb3f5dd 100644
--- a/packages/sol-resolver/CHANGELOG.json
+++ b/packages/sol-resolver/CHANGELOG.json
@@ -5,6 +5,10 @@
             {
                 "note": "Fix a bug where RelativeFSResolver would crash when trying to read a directory",
                 "pr": 909
+            },
+            {
+                "note": "Fix a bug where NpmResolver would crash when trying to read a directory",
+                "pr": 961
             }
         ]
     },
diff --git a/packages/sol-resolver/src/resolvers/npm_resolver.ts b/packages/sol-resolver/src/resolvers/npm_resolver.ts
index 9f86171451..a2df0dcadf 100644
--- a/packages/sol-resolver/src/resolvers/npm_resolver.ts
+++ b/packages/sol-resolver/src/resolvers/npm_resolver.ts
@@ -19,7 +19,7 @@ export class NPMResolver extends Resolver {
             const ROOT_PATH = '/';
             while (currentPath !== ROOT_PATH) {
                 const lookupPath = path.join(currentPath, 'node_modules', packageName, pathWithinPackage);
-                if (fs.existsSync(lookupPath)) {
+                if (fs.existsSync(lookupPath) && fs.lstatSync(lookupPath).isFile()) {
                     const fileContent = fs.readFileSync(lookupPath).toString();
                     return {
                         source: fileContent,