metric.values has error in R v4.0

[leppott]

Describe the bug Calculating metrics for fish results in error and no calculation.

To Reproduce Run example code in metric.values and get error.

# Metrics, MBSS Index, Fish
myIndex <- "MBSS.2005.Fish"
# Thresholds
thresh <- metrics_scoring
# get metric names for myIndex
(myMetrics.Fish <- as.character(droplevels(unique(thresh[thresh[,
"Index.Name"]==myIndex,"MetricName.Other"]))))
# Taxa Data
myDF.Fish <- taxa_fish
myMetric.Values.Fish <- metric.values(myDF.Fish, "fish", myMetrics.Fish)
View(myMetric.Values.Fish)

Expected behavior Should run without error.

Screenshots If applicable, add screenshots to help explain your problem.

Additional context Did not test other R versions.

Sessioninfo below.

[leppott]

[leppott]

Fails when try to add values to be used for adjusted metrics.

[leppott]

Convert met.val to data frame right after it is created.