do not log multiple times due to pushing log-handlers multiple times

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

lib/Froxlor/FroxlorLogger.php

@@ -40,6 +40,13 @@ class FroxlorLogger
 	 */
 	private static $userinfo = array();
 
+	/**
+	 * whether the logger object has already been initialized
+	 *
+	 * @var bool
+	 */
+	private static $is_initialized = false;
+
 	const USR_ACTION = '10';
 
 	const RES_ACTION = '20';
@@ -72,6 +79,7 @@ class FroxlorLogger
 			}
 		}
 
+		if (self::$is_initialized == false) {
 			foreach (self::$logtypes as $logger) {
 
 				switch ($logger) {
@@ -86,6 +94,8 @@ class FroxlorLogger
 						break;
 				}
 			}
+			self::$is_initialized = true;
+		}
 	}
 
 	/**