diff --git a/.codeclimate.yml b/.codeclimate.yml
index 53f90d17..fbd96af2 100644
--- a/.codeclimate.yml
+++ b/.codeclimate.yml
@@ -5,11 +5,13 @@ engines:
   bundler-audit:
     enabled: true
   duplication:
-    enabled: false
+    enabled: true
     config:
       languages:
-      - ruby
-      - javascript
+        ruby:
+          mass_threshold: 36 # default: 18
+        javascript:
+          mass_threshold: 80 # default: 40
   eslint:
     enabled: true
     channel: "eslint-3"
diff --git a/frontend/src/Metamaps/Import.js b/frontend/src/Metamaps/Import.js
index aa75b382..1307aa45 100644
--- a/frontend/src/Metamaps/Import.js
+++ b/frontend/src/Metamaps/Import.js
@@ -54,13 +54,13 @@ const Import = {
 
     const topicsPromise = $.Deferred()
     parse(topicsText, csv_parser_options, (err, data) => {
-      if (err) topicsPromise.reject(err)
+      if (err) return topicsPromise.reject(err)
       topicsPromise.resolve(data.map(row => self.lowercaseKeys(row)))
     })
 
     const synapsesPromise = $.Deferred()
     parse(synapsesText, csv_parser_options, (err, data) => {
-      if (err) synapsesPromise.reject(err)
+      if (err) return synapsesPromise.reject(err)
       synapsesPromise.resolve(data.map(row => self.lowercaseKeys(row)))
     })
 
diff --git a/frontend/src/Metamaps/PasteInput.js b/frontend/src/Metamaps/PasteInput.js
index 13258857..e7029d66 100644
--- a/frontend/src/Metamaps/PasteInput.js
+++ b/frontend/src/Metamaps/PasteInput.js
@@ -63,7 +63,8 @@ const PasteInput = {
       Import.handleJSON(text)
     } else if (text.match(/\t/)) {
       Import.handleTSV(text)
-    } else if (text.match(/","/)) {
+    } else {
+      // just try to see if CSV works
       Import.handleCSV(text)
     }
   },
diff --git a/webpack.config.js b/webpack.config.js
index fcdcbc04..f94f904a 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,4 +1,3 @@
-const path = require('path')
 const webpack = require('webpack')
 
 const NODE_ENV = process.env.NODE_ENV || 'development'
@@ -15,9 +14,12 @@ if (NODE_ENV === 'production') {
   }))
 }
 
+const devtool = NODE_ENV === 'production' ? undefined : 'cheap-module-eval-source-map'
+
 const config = module.exports = {
   context: __dirname,
   plugins,
+  devtool,
   module: {
     loaders: [
       {