Bode function only run once

[Nick7]

Hello
I am running the following script:
 

pkg load control;
clear global;
s = tf('s');
tf = 1/(1+s*0.318e-8);
bode(tf);


The first run time the Bode plots appears well. When I try to rerun the
script the following error appears:

>> Bode

error: freqresp: second argument 'w' must be a real-valued vector of
frequencies
error: called from
    freqresp at line 52 column 5
    subsref at line 39 column 13
    Bode at line 3 column 3
>>

Any help please?

Regards
 Nick



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