diff --git a/libraries/export/htmlword.php b/libraries/export/htmlword.php
index 1740f3a1c..e1efdd4ec 100644
--- a/libraries/export/htmlword.php
+++ b/libraries/export/htmlword.php
@@ -300,7 +300,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
             $strAttribute = 'UNSIGNED ZEROFILL';
         }
         if (!isset($row['Default'])) {
-            if ($row['Null'] != '') {
+            if ($row['Null'] != 'NO') {
                 $row['Default'] = 'NULL';
             }
         } else {
@@ -319,7 +319,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
         }
         $schema_insert .= '<td class="print">' . $fmt_pre . htmlspecialchars($row['Field']) . $fmt_post . '</td>';
         $schema_insert .= '<td class="print">' . htmlspecialchars($type) . '</td>';
-        $schema_insert .= '<td class="print">' . htmlspecialchars($row['Null'] == '' ? $GLOBALS['strNo'] : $GLOBALS['strYes']) . '</td>';
+        $schema_insert .= '<td class="print">' . htmlspecialchars(($row['Null'] == '' || $row['Null'] == 'NO') ? $GLOBALS['strNo'] : $GLOBALS['strYes']) . '</td>';
         $schema_insert .= '<td class="print">' . htmlspecialchars(isset($row['Default']) ? $row['Default'] : '') . '</td>';
 
         $field_name = $row['Field'];
diff --git a/libraries/export/latex.php b/libraries/export/latex.php
index fe6d9f27a..d42e85b44 100644
--- a/libraries/export/latex.php
+++ b/libraries/export/latex.php
@@ -417,7 +417,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
             $zerofill     = preg_match('/ZEROFILL/i', $row['Type']);
         }
         if (!isset($row['Default'])) {
-            if ($row['Null'] != '') {
+            if ($row['Null'] != 'NO') {
                 $row['Default'] = 'NULL';
             }
         } else {
@@ -426,7 +426,9 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
 
         $field_name = $row['Field'];
 
-        $local_buffer = $field_name . "\000" . $type . "\000" . (($row['Null'] == '') ? $GLOBALS['strNo'] : $GLOBALS['strYes'])  . "\000" . (isset($row['Default']) ? $row['Default'] : '');
+        $local_buffer = $field_name . "\000" . $type . "\000" 
+            . (($row['Null'] == '' || $row['Null'] == 'NO') ? $GLOBALS['strNo'] : $GLOBALS['strYes'])  
+            . "\000" . (isset($row['Default']) ? $row['Default'] : '');
 
         if ($do_relation && $have_rel) {
             $local_buffer .= "\000";
diff --git a/libraries/export/odt.php b/libraries/export/odt.php
index 136c639b6..aeeb25a89 100644
--- a/libraries/export/odt.php
+++ b/libraries/export/odt.php
@@ -356,7 +356,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
             . '<text:p>' . htmlspecialchars($type) . '</text:p>'
             . '</table:table-cell>';
         if (!isset($row['Default'])) {
-            if ($row['Null'] != '') {
+            if ($row['Null'] != 'NO') {
                 $row['Default'] = 'NULL';
             } else {
                 $row['Default'] = '';
@@ -365,7 +365,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
             $row['Default'] = $row['Default'];
         }
         $GLOBALS['odt_buffer'] .= '<table:table-cell office:value-type="string">'
-            . '<text:p>' . htmlspecialchars(($row['Null'] == '') ? $GLOBALS['strNo'] : $GLOBALS['strYes']) . '</text:p>'
+            . '<text:p>' . htmlspecialchars(($row['Null'] == '' || $row['Null'] == 'NO') ? $GLOBALS['strNo'] : $GLOBALS['strYes']) . '</text:p>'
             . '</table:table-cell>';
         $GLOBALS['odt_buffer'] .= '<table:table-cell office:value-type="string">'
             . '<text:p>' . htmlspecialchars($row['Default']) . '</text:p>'
diff --git a/libraries/export/texytext.php b/libraries/export/texytext.php
index 544d67407..e3d98a731 100644
--- a/libraries/export/texytext.php
+++ b/libraries/export/texytext.php
@@ -289,7 +289,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
             $strAttribute = 'UNSIGNED ZEROFILL';
         }
         if (!isset($row['Default'])) {
-            if ($row['Null'] != '') {
+            if ($row['Null'] != 'NO') {
                 $row['Default'] = 'NULL';
             }
         } else {
@@ -308,7 +308,7 @@ function PMA_exportStructure($db, $table, $crlf, $error_url, $do_relation = fals
         }
         $text_output .= '|' . $fmt_pre . htmlspecialchars($row['Field']) . $fmt_post;
         $text_output .= '|' . htmlspecialchars($type);
-        $text_output .= '|' . htmlspecialchars($row['Null'] == '' ? $GLOBALS['strNo'] : $GLOBALS['strYes']);
+        $text_output .= '|' . htmlspecialchars(($row['Null'] == '' || $row['Null'] == 'NO') ? $GLOBALS['strNo'] : $GLOBALS['strYes']);
         $text_output .= '|' . htmlspecialchars(isset($row['Default']) ? $row['Default'] : '');
 
         $field_name = $row['Field'];