diff --git a/views/bootstrap/class.CheckInDocument.php b/views/bootstrap/class.CheckInDocument.php
index 154311499..62c96d2a8 100644
--- a/views/bootstrap/class.CheckInDocument.php
+++ b/views/bootstrap/class.CheckInDocument.php
@@ -104,6 +104,21 @@ $(document).ready(function() {
 			print "</div>";
 		}
 
+		$checkoutinfo = $document->getCheckOutInfo();
+		if(!$checkoutinfo) {
+			$this->errorMsg(getMLText('error_occured'));
+			$this->contentEnd();
+			$this->htmlEndPage();
+			exit;
+		}
+		$info = $checkoutinfo[0];
+		if($user->getID() != $info['userID'] && $document->getAccessMode($user) < M_ALL) {
+			$this->errorMsg(getMLText('access_denied'));
+			$this->contentEnd();
+			$this->htmlEndPage();
+			exit;
+		}
+
 		if ($checkoutstatus = $document->checkOutStatus()) {
 			switch($checkoutstatus) {
 			case 1:
@@ -117,7 +132,6 @@ $(document).ready(function() {
 				break;
 			}
 		}
-		$checkoutinfo = $document->getCheckOutInfo();
 
 		$this->rowStart();
 		if($checkoutstatus == 0) {