diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79dfe9b..a34ec20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,12 @@
 * promise: new API module
 * errors: finish normalisation of all errors
 
+## Trunk
+
+* errors: don't stringify/parse undefined and null values
+* errors: expose CSV_NON_TRIMABLE_CHAR_AFTER_CLOSING_QUOTE
+* errors: expose CSV_MAX_RECORD_SIZE
+
 ## Version 4.6.3
 
 * lint: integrate eslint
diff --git a/lib/es5/index.js b/lib/es5/index.js
index 1ea9e42..ae57d8a 100644
--- a/lib/es5/index.js
+++ b/lib/es5/index.js
@@ -1216,8 +1216,8 @@ function (_Error) {
       var context = _contexts[_i2];
 
       for (var key in context) {
-        var value = Buffer.isBuffer(context[key]) ? context[key].toString() : context[key];
-        _this2[key] = JSON.parse(JSON.stringify(value));
+        var value = context[key];
+        _this2[key] = Buffer.isBuffer(value) ? value.toString() : value == null ? value : JSON.parse(JSON.stringify(value));
       }
     }
 
diff --git a/lib/index.js b/lib/index.js
index e1d51f3..3106e08 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -969,8 +969,8 @@ class CsvError extends Error {
     this.code = code
     for(const context of contexts){
       for(const key in context){
-        const value = Buffer.isBuffer(context[key]) ? context[key].toString() : context[key]
-        this[key] = JSON.parse(JSON.stringify(value))
+        const value = context[key]
+        this[key] = Buffer.isBuffer(value) ? value.toString() : value == null ? value : JSON.parse(JSON.stringify(value))
       }
     }
   }
diff --git a/test/option.columns.coffee b/test/option.columns.coffee
index 8b94954..bb25f29 100644
--- a/test/option.columns.coffee
+++ b/test/option.columns.coffee
@@ -181,6 +181,19 @@ describe 'Option `columns`', ->
           { a: '3' }
         ] unless err
         next err
+    
+    it '', (next) ->
+      # Trigger a bug where error is try to stringify and parse an undefined
+      # value, conjointly triggered by a null column and a
+      # CSV_INVALID_RECORD_LENGTH_DONT_MATCH_COLUMNS error
+      parse """
+      col_a,col_b,col_c
+      foo,bar
+      foo,bar,baz
+      """
+      , columns: ['a', 'b', null], (err, data) ->
+        err.code.should.eql 'CSV_INVALID_RECORD_LENGTH_DONT_MATCH_COLUMNS'
+        next()
 
   describe 'function', ->
   
diff --git a/test/option.skip_lines_with_error.coffee b/test/option.skip_lines_with_error.coffee
index dad325f..9f9d70d 100644
--- a/test/option.skip_lines_with_error.coffee
+++ b/test/option.skip_lines_with_error.coffee
@@ -46,6 +46,7 @@ describe 'Option `skip_lines_with_error`', ->
         ["line","1"]
         ["line", "3"]
       ] unless err
+      console.log errors
       assert_error errors, [
         message: 'Invalid Opening Quote: a quote is found inside a field at line 2'
         code: 'INVALID_OPENING_QUOTE'