diff --git a/Classes/PHPExcel/Writer/PDF/DomPDF.php b/Classes/PHPExcel/Writer/PDF/DomPDF.php
index 2784e149..82bfaeac 100644
--- a/Classes/PHPExcel/Writer/PDF/DomPDF.php
+++ b/Classes/PHPExcel/Writer/PDF/DomPDF.php
@@ -27,7 +27,12 @@
 
 
 /** Require DomPDF library */
-require_once PHPExcel_Settings::getPdfRendererPath() . '/dompdf_config.inc.php';
+$pdfRendererClassFile = PHPExcel_Settings::getPdfRendererPath() . '/dompdf_config.inc.php';
+if (file_exists($pdfRendererClassFile)) {
+	require_once $pdfRendererClassFile;
+} else {
+	throw new Exception('Unable to load PDF Rendering library');
+}
 
 /**
  * PHPExcel_Writer_PDF_DomPDF
diff --git a/Classes/PHPExcel/Writer/PDF/mPDF.php b/Classes/PHPExcel/Writer/PDF/mPDF.php
index e8ff3201..ccd17a22 100644
--- a/Classes/PHPExcel/Writer/PDF/mPDF.php
+++ b/Classes/PHPExcel/Writer/PDF/mPDF.php
@@ -27,7 +27,12 @@
 
 
 /** Require mPDF library */
-require_once PHPExcel_Settings::getPdfRendererPath() . '/mpdf.php';
+$pdfRendererClassFile = PHPExcel_Settings::getPdfRendererPath() . '/mpdf.php';
+if (file_exists($pdfRendererClassFile)) {
+	require_once $pdfRendererClassFile;
+} else {
+	throw new Exception('Unable to load PDF Rendering library');
+}
 
 /**
  * PHPExcel_Writer_PDF_mPDF
diff --git a/Classes/PHPExcel/Writer/PDF/tcPDF.php b/Classes/PHPExcel/Writer/PDF/tcPDF.php
index f342a654..08e7ca78 100644
--- a/Classes/PHPExcel/Writer/PDF/tcPDF.php
+++ b/Classes/PHPExcel/Writer/PDF/tcPDF.php
@@ -27,8 +27,13 @@
 
 
 /** Require tcPDF library */
-$k_path_url = PHPExcel_Settings::getPdfRendererPath();
-require_once PHPExcel_Settings::getPdfRendererPath() . '/tcpdf.php';
+$pdfRendererClassFile = PHPExcel_Settings::getPdfRendererPath() . '/tcpdf.php';
+if (file_exists($pdfRendererClassFile)) {
+	$k_path_url = PHPExcel_Settings::getPdfRendererPath();
+	require_once $pdfRendererClassFile;
+} else {
+	throw new Exception('Unable to load PDF Rendering library');
+}
 
 /**
  * PHPExcel_Writer_PDF_tcPDF