diff --git a/.svgo.yml b/.svgo.yml
index 43a15d5bd..eedb2ea1c 100644
--- a/.svgo.yml
+++ b/.svgo.yml
@@ -55,3 +55,11 @@ plugins:
   - removeAttrs
   - addClassesToSVGElement
   - removeStyleElement
+
+# configure the indent (default 4 spaces) used by `--pretty` here:
+#
+# @see https://github.com/svg/svgo/blob/master/lib/svgo/js2svg.js#L6 for more config options
+#
+# js2svg:
+#  pretty: true
+#  indent: '  '
diff --git a/lib/svgo/jsAPI.js b/lib/svgo/jsAPI.js
index 6355b9023..bbc99fb4b 100644
--- a/lib/svgo/jsAPI.js
+++ b/lib/svgo/jsAPI.js
@@ -22,7 +22,7 @@ JSAPI.prototype.clone = function() {
     var nodeData = {};
 
     Object.keys(node).forEach(function(key) {
-        if (key != 'content') {
+        if (key !== 'content') {
             nodeData[key] = node[key];
         }
     });
@@ -72,7 +72,7 @@ JSAPI.prototype.isElem = function(param) {
  */
 JSAPI.prototype.renameElem = function(name) {
 
-    if (typeof name == 'string' && name != '')
+    if (name && typeof name === 'string')
         this.elem = this.local = name;
 
     return this;
@@ -198,16 +198,16 @@ JSAPI.prototype.renameElem = function(name) {
 /**
  * Add attribute.
  *
- * @param {Object} attr attribute object
- * @return {Object} created attribute
+ * @param {Object} [attr={}] attribute object
+ * @return {Object|Boolean} created attribute or false if no attr was passed in
  */
  JSAPI.prototype.addAttr = function(attr) {
+    attr = attr || {};
 
-    if (!attr ||
-        (attr && attr.name === undefined) ||
-        (attr && attr.value === undefined) ||
-        (attr && attr.prefix === undefined) ||
-        (attr && attr.local === undefined)
+    if (attr.name === undefined ||
+        attr.value === undefined ||
+        attr.prefix === undefined ||
+        attr.local === undefined
     ) return false;
 
     this.attrs = this.attrs || {};
diff --git a/test/svg2js/_index.js b/test/svg2js/_index.js
index b57afd917..d88a16f30 100644
--- a/test/svg2js/_index.js
+++ b/test/svg2js/_index.js
@@ -380,4 +380,73 @@ describe('svg2js', function() {
 
     });
 
+    describe('malformed svg', function() {
+
+        var filepath = PATH.resolve(__dirname, './test.bad.svg'),
+            root,
+            error;
+
+        before(function(done) {
+
+            FS.readFile(filepath, 'utf8', function(err, data) {
+                if (err) {
+                    throw err;
+                }
+
+                try {
+                    SVG2JS(data, function(result) {
+                        root = result;
+                    });
+                } catch (e) {
+                    error = e;
+                }
+
+                done();
+            });
+
+        });
+
+        describe('root', function() {
+
+            it('should have property "error"', function() {
+                return root.should.have.property('error');
+            });
+
+        });
+
+        describe('root.error', function() {
+
+            it('should be an instance of String', function() {
+                return root.error.should.an.instanceOf(String);
+            });
+
+            it('should be "Error in parsing: Unmatched closing tag: style"', function() {
+                return root.error.should.equal('Error in parsing: Unmatched closing tag: style');
+            });
+
+        });
+
+        describe('thrown error', function() {
+
+            it('should be an instance of Error', function() {
+                return error.should.be.an.instanceOf(Error);
+            });
+
+            it('should stringify to "Error: Unmatched closing tag: style"', function() {
+                return error.toString().should.equal('Error: Unmatched closing tag: style');
+            });
+
+            it('should roughly match root.error', function() {
+                var rootErrorParts = root.error.split(':'),
+                    thrownErrorParts = error.toString().split(':');
+
+                return rootErrorParts.reduce(function(result, value, index) {
+                    return result && value.indexOf(thrownErrorParts[index]) === 0;
+                }, true).should.be.true();
+            });
+
+        });
+
+    });
+
 });