diff --git a/fixtures/namespace_not_first.php b/fixtures/namespace_not_first.php
new file mode 100644
index 0000000..8ef98e4
--- /dev/null
+++ b/fixtures/namespace_not_first.php
@@ -0,0 +1,5 @@
+<?php
+
+echo "Hello";
+
+namespace A;
\ No newline at end of file
diff --git a/src/PhpDocument.php b/src/PhpDocument.php
index 963e0c9..f0136ad 100644
--- a/src/PhpDocument.php
+++ b/src/PhpDocument.php
@@ -176,10 +176,11 @@ class PhpDocument
         $diagnostics = [];
         foreach ($errors as $error) {
             $diagnostic = new Diagnostic();
-            $diagnostic->range = new Range(
-                new Position($error->getStartLine() - 1, $error->hasColumnInfo() ? $error->getStartColumn($this->content) - 1 : 0),
-                new Position($error->getEndLine() - 1, $error->hasColumnInfo() ? $error->getEndColumn($this->content) : 0)
-            );
+            $startLine = max($error->getStartLine() - 1, 0);
+            $startColumn = $error->hasColumnInfo() ? $error->getStartColumn($this->content) - 1 : 0;
+            $endLine = max($error->getEndLine() - 1, $startLine);
+            $endColumn = $error->hasColumnInfo() ? $error->getEndColumn($this->content) : 0;
+            $diagnostic->range = new Range(new Position($startLine, $startColumn), new Position($endLine, $endColumn));
             $diagnostic->severity = DiagnosticSeverity::ERROR;
             $diagnostic->source = 'php';
             // Do not include "on line ..." in the error message
diff --git a/tests/Server/TextDocument/ParseErrorsTest.php b/tests/Server/TextDocument/ParseErrorsTest.php
index 24d155c..37ce769 100644
--- a/tests/Server/TextDocument/ParseErrorsTest.php
+++ b/tests/Server/TextDocument/ParseErrorsTest.php
@@ -15,18 +15,12 @@ class ParseErrorsTest extends TestCase
      */
     private $textDocument;
 
+    private $args;
+
     public function setUp()
     {
         $client = new LanguageClient(new MockProtocolStream());
-        $project = new Project($client);
-        $this->textDocument = new Server\TextDocument($project, $client);
-    }
-
-    public function testParseErrorsArePublishedAsDiagnostics()
-    {
-        $args = null;
-        $client = new LanguageClient(new MockProtocolStream());
-        $client->textDocument = new class($args) extends Client\TextDocument {
+        $client->textDocument = new class($this->args) extends Client\TextDocument {
             private $args;
             public function __construct(&$args)
             {
@@ -38,18 +32,22 @@ class ParseErrorsTest extends TestCase
                 $this->args = func_get_args();
             }
         };
-
         $project = new Project($client);
+        $this->textDocument = new Server\TextDocument($project, $client);
+    }
 
-        $textDocument = new Server\TextDocument($project, $client);
-
-        // Trigger parsing of source
+    private function openFile($file) {
         $textDocumentItem = new TextDocumentItem();
         $textDocumentItem->uri = 'whatever';
         $textDocumentItem->languageId = 'php';
         $textDocumentItem->version = 1;
-        $textDocumentItem->text = file_get_contents(__DIR__ . '/../../../fixtures/invalid_file.php');
-        $textDocument->didOpen($textDocumentItem);
+        $textDocumentItem->text = file_get_contents($file);
+        $this->textDocument->didOpen($textDocumentItem);
+    }
+
+    public function testParseErrorsArePublishedAsDiagnostics()
+    {
+        $this->openFile(__DIR__ . '/../../../fixtures/invalid_file.php');
         $this->assertEquals([
             'whatever',
             [[
@@ -68,6 +66,30 @@ class ParseErrorsTest extends TestCase
                 'source' => 'php',
                 'message' => "Syntax error, unexpected T_CLASS, expecting T_STRING"
             ]]
-        ], json_decode(json_encode($args), true));
+        ], json_decode(json_encode($this->args), true));
+    }
+
+    public function testParseErrorsWithOnlyStartLine()
+    {
+        $this->openFile(__DIR__ . '/../../../fixtures/namespace_not_first.php');
+        $this->assertEquals([
+            'whatever',
+            [[
+                'range' => [
+                    'start' => [
+                        'line' => 4,
+                        'character' => 0
+                    ],
+                    'end' => [
+                        'line' => 4,
+                        'character' => 0
+                    ]
+                ],
+                'severity' => DiagnosticSeverity::ERROR,
+                'code' => null,
+                'source' => 'php',
+                'message' => "Namespace declaration statement has to be the very first statement in the script"
+            ]]
+        ], json_decode(json_encode($this->args), true));
     }
 }