Index: units/helpers/multilanguage_helper.php
===================================================================
--- units/helpers/multilanguage_helper.php	(revision 13329)
+++ units/helpers/multilanguage_helper.php	(working copy)
@@ -226,7 +226,7 @@
 			$ret = $this->scanTable('/^l[\d]+_'.preg_quote($field_name, '/').'$/');
 			if (!$ret) {
 				// no multilingual fields at all (but we have such field without language prefix)
-				$original_found = $this->scanTable('/'.preg_quote($field_name, '/').'/');
+				$original_found = $this->scanTable('/^'.preg_quote($field_name, '$/').'/');
 				$this->curSourceField = $original_found ? $field_name : false;
 			}
 			else {