[R] glm problem

[rach.s]

Hie,
I've used GLM function, n try to get a convergence by using a while loop and
break it when my absolute value between the 2 values is less than 1e-09. But
i got this warning message, what does this mean? how should i correct my
algorithm? my start value is 0.5. 
Error in if (abs((phi_0) - (phi_1)) < 1e-09) { : 
        missing value where TRUE/FALSE needed

Thankss
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