r - How to change na.action for zero-inflated regression model? -

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i running zero-inflated negative binomial regression model using function zeroinfl pscl package.

i need exclude na's model in order able plot residuals against dependent variable later in analysis.

therefore, want set na.action="na.exclude". can without problem non-zero-inflated negative binomial regression model (using glm.nb glm package), eg. 

fm_nbin <- glm.nb(dv ~ factor(idv) + contr1                +contr2 + contr3, data=df,                 subset=(df$var<500), na.action="na.exclude") fm_nbin.res = resid(fm_nbin)  plot(fm_nbin.res~df$var)

works fine. however, when same zero-inflated model, not work: 

zinfl <- zeroinfl(dv ~ factor(idv) + contr1                +contr2 + contr3 | factor(idv) + contr1                +contr2 + contr3, data=df,                 subset=(df$var<500), na.action="na.exclude") zinfl.res = resid(zinfl)  plot(zinfl.res~df$var)

gives error 

error in function (formula, data = null, subset = null, na.action = na.fail,  :    variable lengths differ (found 'df$var')

is there other command should use exclude na's regression?

edit: this nearest of answer find. can in way applied problem? also, can naresid in way applied?

as 1 finds following trail of documentation zeroinfl glm.fit: "the ‘factory-fresh’ default na.omit." notice have not put quotes around since supposed function rather function accept name doesn't matter if quoted. admit don't know how na.omit , na.exclude differ (something residuals read), go default setting first, since delivers want regression functions. try leaving out:

zinfl <- zeroinfl(dv ~ factor(idv) + contr1            +contr2 + contr3 | factor(idv) + contr1            +contr2 + contr3, data=df,             subset=(df$var<500) )

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