diff --git a/lib/filesystemview.php b/lib/filesystemview.php
index 9d530c7ad6..3045fc8b88 100644
--- a/lib/filesystemview.php
+++ b/lib/filesystemview.php
@@ -283,7 +283,11 @@ class OC_FilesystemView {
 		if(OC_Filesystem::isValidPath($path)){
 			$source=$this->fopen($path,'r');
 			if($source){
-				$extention=substr($path,strrpos($path,'.'));
+				$extention='';
+				$extOffset=strpos($path,'.');
+				if($extOffset !== false) {
+					$extention=substr($path,strrpos($path,'.'));
+				}
 				$tmpFile=OC_Helper::tmpFile($extention);
 				file_put_contents($tmpFile,$source);
 				return $tmpFile;