diff --git a/ChangeLog b/ChangeLog
index eace936295..9f20ec7471 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,6 +13,7 @@ phpMyAdmin - ChangeLog
 - bug Incorrect Drizzle 7 detection
 - bug #4019 Create database if not exists (export): add an option to the
   interface to enable generating CREATE DATABASE and USE (false by default)
+- bug #4012 Crash on CSV file import
 
 4.0.4.1 (2013-06-30)
 - [security] Global variables scope injection vulnerability (see PMASA-2013-7)
diff --git a/libraries/import.lib.php b/libraries/import.lib.php
index aa15847a6e..919b92ff97 100644
--- a/libraries/import.lib.php
+++ b/libraries/import.lib.php
@@ -531,13 +531,13 @@ function PMA_getD($last_cumulative_size)
 /**
  * Obtains the decimal size of a given cell
  *
- * @param string &$cell cell content
+ * @param string $cell cell content
  *
  * @return array Contains the precision, scale, and full size
  *                representation of the given decimal cell
  * @access  public
  */
-function PMA_getDecimalSize(&$cell)
+function PMA_getDecimalSize($cell)
 {
     $curr_size = strlen((string)$cell);
     $decPos = strpos($cell, ".");
@@ -557,7 +557,7 @@ function PMA_getDecimalSize(&$cell)
  *                                     (NONE or VARCHAR or DECIMAL or INT or BIGINT)
  * @param int    $curr_type            Type of the current cell
  *                                     (NONE or VARCHAR or DECIMAL or INT or BIGINT)
- * @param string &$cell                The current cell
+ * @param string $cell                 The current cell
  *
  * @return string  Size of the given cell in the type-appropriate format
  * @access  public
@@ -565,7 +565,7 @@ function PMA_getDecimalSize(&$cell)
  * @todo    Handle the error cases more elegantly
  */
 function PMA_detectSize($last_cumulative_size, $last_cumulative_type,
-    $curr_type, &$cell
+    $curr_type, $cell
 ) {
     $curr_size = strlen((string)$cell);
 
@@ -756,14 +756,14 @@ function PMA_detectSize($last_cumulative_size, $last_cumulative_type,
  *
  * @param int    $last_cumulative_type Last cumulative column type
  *                                     (VARCHAR or INT or BIGINT or DECIMAL or NONE)
- * @param string &$cell                String representation of the cell for which
+ * @param string $cell                 String representation of the cell for which
  *                                     a best-fit type is to be determined
  *
  * @return int  The MySQL type representation
  *               (VARCHAR or INT or BIGINT or DECIMAL or NONE)
  * @access  public
  */
-function PMA_detectType($last_cumulative_type, &$cell)
+function PMA_detectType($last_cumulative_type, $cell)
 {
     /**
      * If numeric, determine if decimal, int or bigint