diff --git a/R/n_factors.R b/R/n_factors.R
index 7fc55f9a0..7afc40e5c 100644
--- a/R/n_factors.R
+++ b/R/n_factors.R
@@ -131,15 +131,16 @@ n_factors <- function(x,
       nobs <- x
       package <- package[!package %in% c("pcdimension", "PCDimension")]
     } else if (is.matrix(x) || inherits(x, "easycormatrix")) {
-      stop("Please input the correlation matrix via the `cor = ...` argument and
-           the number of rows / observations via the first argument.")
+      insight::format_error(
+        "Please input the correlation matrix via the `cor = ...` argument and the number of rows / observations via the first argument."
+      )
     }
   } else {
     nobs <- nrow(x)
   }
 
   # Get only numeric
-  x <- x[sapply(x, is.numeric)]
+  x <- x[vapply(x, is.numeric, logical(1))]
 
   # Correlation matrix
   if (is.null(cor)) {
diff --git a/R/principal_components.R b/R/principal_components.R
index 52a51195f..be322d349 100644
--- a/R/principal_components.R
+++ b/R/principal_components.R
@@ -263,7 +263,7 @@ principal_components.data.frame <- function(x,
   x <- stats::na.omit(x)
 
   # Select numeric only
-  x <- x[sapply(x, is.numeric)]
+  x <- x[vapply(x, is.numeric, logical(1))]
 
   # N factors
   n <- .get_n_factors(x, n = n, type = "PCA", rotation = rotation)
@@ -456,9 +456,6 @@ principal_components.data.frame <- function(x,
 
   # rotate loadings
   insight::check_if_installed("psych", reason = sprintf("`%s`-rotation.", rotation))
-  if (!requireNamespace("psych", quietly = TRUE)) {
-    insight::format_error(sprintf("Package `psych` required for `%s`-rotation.", rotation))
-  }
 
   pca <- psych::principal(x, nfactors = n, rotate = rotation, ...)
   msa <- psych::KMO(x)