diff --git a/src/Csv.php b/src/Csv.php
index c3b6cc3..c901e71 100644
--- a/src/Csv.php
+++ b/src/Csv.php
@@ -846,7 +846,7 @@ class Csv {
         }
 
         // this is needed because sometime titles property is overwritten instead of using fields parameter!
-        $titlesOnParse = !empty($this->data) ? array_keys($this->data[0]) : array();
+        $titlesOnParse = !empty($this->data) ? array_keys(reset($this->data)) : array();
 
         // both are identical, also in ordering
         if (array_values($fields) === array_values($titlesOnParse)) {
diff --git a/tests/methods/UnparseTest.php b/tests/methods/UnparseTest.php
index 48ebb09..6083724 100644
--- a/tests/methods/UnparseTest.php
+++ b/tests/methods/UnparseTest.php
@@ -75,6 +75,12 @@ class UnparseTest extends Testcase {
         $this->unparseAndCompare($expected, $fields);
     }
 
+    public function testUnparseDefaultFirstRowMissing(){
+        unset($this->csv->data[0]);
+        $expected = "column1,column2\rvalue3,value4\r";
+        $this->unparseAndCompare($expected);
+    }
+
     private function unparseAndCompare($expected, $fields = array()) {
         $str = $this->csv->unparse($this->csv->data, $fields);
         $this->assertEquals($expected, $str);