I'm trying to fit the model

glmer(dummy ~ x + time + (time | subject), data, family=binomial(link
= "logit"), REML=T, verbose=T)

but I keep receiving the following error:

Error in glm.fit(fr$X, fr$Y, weights = wts, offset = offset, family =
family,  :

NA/NaN/Inf in foreign function call (arg 1)

I omitted NAs, changed the model specification, transformed x to log(x) but
nothing solved the problem. I think the problem is on variable 'x' given
that is the only one that causes that problem.

When I run

mod6 <- glmer(dummy ~ a + I(b) + I(c) + d + e + time + (time |
subject) + (time|subjectregion), data=pool, family=binomial(link =
"logit"), REML=T, verbose=T)

I don't have any problem.

Any idea about what is happening?
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