diff --git a/phpgwapi/inc/class.db_backup.inc.php b/phpgwapi/inc/class.db_backup.inc.php
index d349ce4dbd..9bc4563fc8 100644
--- a/phpgwapi/inc/class.db_backup.inc.php
+++ b/phpgwapi/inc/class.db_backup.inc.php
@@ -575,7 +575,7 @@ class db_backup
 			{
 				if ($rows)	// flush pending rows of last table
 				{
-					$this->db->insert($table,$rows,False,__LINE__,__FILE__,false,false,$this->schemas[$table]);
+					$this->insert_multiple($table, $rows, $this->schemas[$table]);
 				}
 				$rows = array();
 				$table = substr($line,7);
@@ -631,7 +631,7 @@ class db_backup
 							$rows[] = $data;
 							if (count($rows) == $insert_n_rows)
 							{
-								$this->db->insert($table,$rows,False,__LINE__,__FILE__,false,false,$this->schemas[$table]);
+								$this->insert_multiple($table, $rows, $this->schemas[$table]);
 								$rows = array();
 							}
 						}
@@ -645,7 +645,12 @@ class db_backup
 						}
 						else
 						{
-							$this->db->insert($table,$data,False,__LINE__,__FILE__,false,false,$this->schemas[$table]);
+							try {
+								$this->db->insert($table,$data,False,__LINE__,__FILE__,false,false,$this->schemas[$table]);
+							}
+							catch(egw_exception_db_invalid_sql $e) {
+								echo "<p>".$e->getMessage()."</p>\n";
+							}
 						}
 					}
 					else
@@ -658,7 +663,7 @@ class db_backup
 		}
 		if ($rows)	// flush pending rows
 		{
-			$this->db->insert($table,$rows,False,__LINE__,__FILE__,false,false,$this->schemas[$table]);
+			$this->insert_multiple($table, $rows, $this->schemas[$table]);
 		}
 		// updated the sequences, if the DB uses them
 		foreach($this->schemas as $table => $schema)
@@ -675,6 +680,33 @@ class db_backup
 		return $n;
 	}
 
+	/**
+	 * Insert multiple rows ignoring doublicate entries
+	 *
+	 * @param string $table
+	 * @param array $rows
+	 * @param array $schema
+	 */
+	private function insert_multiple($table, array $rows, array $schema)
+	{
+		try {
+			$this->db->insert($table, $rows, False, __LINE__, __FILE__, false, false, $schema);
+		}
+		catch(egw_exception_db_invalid_sql $e)
+		{
+			// try inserting them one by one, ignoring doublicates
+			foreach($rows as $data)
+			{
+				try {
+					$this->db->insert($table, $data, False, __LINE__, __FILE__, false, false, $schema);
+				}
+				catch(egw_exception_db_invalid_sql $e) {
+					echo "<p>".$e->getMessage()."</p>\n";
+				}
+			}
+		}
+	}
+
 	/**
 	 * Removes a dir, no matter whether it is empty or full
 	 *