$eintrag->bind_param($titel, $user, $datum, $desc, $FTF, $STF, $TTF, $type, $Lat, $Lon, $shortdesc, $genlink); // line 44
You need to the define the type of parameters as this:
$eintrag->bind_param("ssssssiiss", $titel, $user, $datum, $desc, $FTF, $STF, $TTF, $type, $Lat, $Lon, $shortdesc, $genlink); // line 44
s - string i - int Also check documentation: http://php.net/manual/en/mysqli-stmt.bind-param.php