Index: units/helpers/language_import_helper.php
===================================================================
--- units/helpers/language_import_helper.php	(revision 13756)
+++ units/helpers/language_import_helper.php	(working copy)
@@ -895,7 +895,10 @@
 				$this->Application->Debugger->profileFinish('L[' . $language_id . ']E', 'Language: ' . $language_id . '; Events Import');
 			}
 
-			$this->Conn->doInsert($fields_hash, $this->_tables['emailevents'], 'REPLACE');
+			if (isset($fields_hash)) {
+				// at least one email event in language pack was found in database
+				$this->Conn->doInsert($fields_hash, $this->_tables['emailevents'], 'REPLACE');
+			}
 		}
 
 		/**