Wheezy rtl8187 fixed channel mon0: -1 problem

[Ricca]

Hi, I have get an error with my usb wireless card (GE-RT8187) running aircrack.
I run aircrack using the following:

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:~# airmon-ng check kill
:~# airmon-ng start wlan1

Interface	Chipset		Driver

wlan1		Realtek RTL8187L	rtl8187 - [phy1]
				(monitor mode enabled on mon0)
wlan0		Broadcom	b43 - [phy0]

I get the this message when I run airodump:

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:~# airodump-ng -c 11 --bssid XX:XX:XX:XX:XX:XX -w my_handshake mon0
CH 11 ][ Elapsed: 2 mins ][ 2015-03-28 12:34 ][ fixed channel mon0: -1

I run wheezy fully update using the stock kernel 3.2.0-4-amd64 and in this page (https://wiki.debian.org/rtl818x#Drivers) I read that the rtl8187 drivers are included in the kernel since 2.6.27.

Do you have any suggestion to overcome this problem?