[STUMP] Crash Report

Hi, I have received a crash. I haven't pasted the whole thing as I am 
not sure if it is worth it. I am using an nvidia driver, and I was 
trying to clone the display onto tv-out. There are warnings about the 
nvidia driver when I start the system but it works ok most of the time. 
I usually extend the desktop rather than clone.

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The value NIL is not of type STUMPWM::FRAME.
0: (SB-DEBUG::MAP-BACKTRACE
    #<CLOSURE (LAMBDA # :IN SB-DEBUG:BACKTRACE) {10082AF3EB}>
    :START
    0
    :COUNT
    100)
1: (SB-DEBUG:BACKTRACE 100 #<SB-IMPL::STRING-OUTPUT-STREAM 
{10082AF313}>)
2: (STUMPWM::BACKTRACE-STRING)
3: (STUMPWM::PERFORM-TOP-LEVEL-ERROR-ACTION
    #<TYPE-ERROR expected-type: STUMPWM::FRAME datum: NIL>)
4: (SIGNAL #<TYPE-ERROR expected-type: STUMPWM::FRAME datum: NIL>)
5: (ERROR TYPE-ERROR :DATUM NIL :EXPECTED-TYPE STUMPWM::FRAME)
6: (SB-KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER
    #<unavailable argument>
    #.(SB-SYS:INT-SAP #X7FFFF6E1ED80)
    #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #X7FFFF6E1E900 :TYPE (*
                                                                 
(SB-ALIEN:STRUCT
                                                                  
SB-VM::OS-CONTEXT-T-STRUCT))>
    (149 21))
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