diff --git a/NAMESPACE b/NAMESPACE
index 851bbaedb..29f0dea16 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -179,6 +179,7 @@ S3method(estimate_density,blrm)
 S3method(estimate_density,brmsfit)
 S3method(estimate_density,data.frame)
 S3method(estimate_density,default)
+S3method(estimate_density,double)
 S3method(estimate_density,draws)
 S3method(estimate_density,emmGrid)
 S3method(estimate_density,emm_list)
diff --git a/R/estimate_density.R b/R/estimate_density.R
index bde761d40..d44233c17 100644
--- a/R/estimate_density.R
+++ b/R/estimate_density.R
@@ -345,6 +345,12 @@ estimate_density.grouped_df <- function(x,
   do.call(rbind, out)
 }
 
+# to avoid class conflicts - e.g., numeric variables imported with the
+# haven package are of class "haven_labelled" and "double", which causes
+# problems with the generic or numeric method.
+
+#' @export
+estimate_density.double <- estimate_density.numeric
 
 #' @export
 estimate_density.emmGrid <- function(x,
diff --git a/man/diagnostic_posterior.Rd b/man/diagnostic_posterior.Rd
index ab4e39938..d99d377dd 100644
--- a/man/diagnostic_posterior.Rd
+++ b/man/diagnostic_posterior.Rd
@@ -38,21 +38,13 @@ with one or more of these options: \code{"ESS"}, \code{"Rhat"}, \code{"MCSE"} or
 \item{effects}{Should parameters for fixed effects, random effects
 or both be returned? Only applies to mixed models. May be abbreviated.}
 
-\item{component}{Which type of parameters to return, such as parameters for the
+\item{component}{Should all predictor variables, predictor variables for the
 conditional model, the zero-inflated part of the model, the dispersion
-term, the instrumental variables or marginal effects be returned? Applies
-to models with zero-inflated and/or dispersion formula, or to models with
-instrumental variables (so called fixed-effects regressions), or models
-with marginal effects from \pkg{mfx}. May be abbreviated. Note that the
+term or the instrumental variables be returned? Applies to models
+with zero-inflated and/or dispersion formula, or to models with instrumental
+variable (so called fixed-effects regressions). May be abbreviated. Note that the
 \emph{conditional} component is also called \emph{count} or \emph{mean}
-component, depending on the model. There are three convenient shortcuts:
-\code{component = "all"} returns all possible parameters.
-If \code{component = "location"}, location parameters such as \code{conditional},
-\code{zero_inflated}, \code{smooth_terms}, or \code{instruments} are returned
-(everything that are fixed or random effects - depending on the \code{effects}
-argument - but no auxiliary parameters). For \code{component = "distributional"}
-(or \code{"auxiliary"}), components like \code{sigma}, \code{dispersion},
-\code{beta} or \code{precision} (and other auxiliary parameters) are returned.}
+component, depending on the model.}
 
 \item{parameters}{Regular expression pattern that describes the parameters that
 should be returned.}