P value equal to 1?

I am running the following logistic mixed model in lme4:

CAPS_PDI_Cond25_CV<- glmer(Response ~ caps_AvSev.ct + pdi_AvSev.ct + Av_dBSNR.ct + num_train.ct + (1|Pt_ID), family= binomial, data = lme.df_25,control=glmerControl(optimizer="bobyqa"))

I am getting the following model results:

Fixed effects:                Estimate Std. Error z value Pr(>|z|)    (Intercept)   -1.046e+00  1.050e-01  -9.960  < 2e-16 ***caps_AvSev.ct  4.805e-02  3.384e-02   1.420    0.156    pdi_AvSev.ct   8.753e-06  3.217e-02   0.000    1.000    Av_dBSNR.ct    1.835e-01  3.909e-02   4.695 2.66e-06 ***num_train.ct  -3.883e-03  5.005e-03  -0.776    0.438    ---Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘’ 1

Why do I get a p-value of 1 for pdi_AvSev.ct?