diff --git a/gulliver/system/class.g.php b/gulliver/system/class.g.php
index b70a5d488..147b03aa8 100644
--- a/gulliver/system/class.g.php
+++ b/gulliver/system/class.g.php
@@ -2970,11 +2970,10 @@ class G
      */
     public function is_utf8 ($string)
     {
-        if (is_array( $string )) {
-            $enc = implode( '', $string );
-            return @! ((ord( $enc[0] ) != 239) && (ord( $enc[1] ) != 187) && (ord( $enc[2] ) != 191));
+        if (preg_match('//u', $string)) {
+            return true;
         } else {
-            return (utf8_encode( utf8_decode( $string ) ) == $string);
+            return false;
         }
     }
 
diff --git a/workflow/engine/controllers/pmTablesProxy.php b/workflow/engine/controllers/pmTablesProxy.php
index 2f92242a9..3db3891ae 100644
--- a/workflow/engine/controllers/pmTablesProxy.php
+++ b/workflow/engine/controllers/pmTablesProxy.php
@@ -506,7 +506,12 @@ class pmTablesProxy extends HttpProxyController
                             $j = 0;
                             foreach ($aAdditionalTables['FIELDS'] as $aField) {
                                 $conData++;
-                                $temp = (array_key_exists($j, $aAux))? '"' . addslashes(stripslashes(utf8_encode($aAux[$j]))) . '"' : '""';
+
+                                if (array_key_exists($j, $aAux)) {
+                                    $temp = '"' . addslashes(stripslashes(G::is_utf8($aAux[$j]) ? $aAux[$j] : utf8_encode($aAux[$j]))) . '"';
+                                } else {
+                                    $temp = '""';
+                                }
 
                                 if ($temp == '') {
                                     switch ($aField['FLD_TYPE']) {