diff --git a/src/DimensionalData.jl b/src/DimensionalData.jl
index 1600a41f6..c7cda2628 100644
--- a/src/DimensionalData.jl
+++ b/src/DimensionalData.jl
@@ -55,7 +55,7 @@ export AbstractDimArray, DimArray
 
 export AbstractDimStack, DimStack
 
-export AbstractDimTable, DimTable
+export AbstractDimTable, DimTable, WideDimTable
 
 export DimIndices, DimKeys, DimPoints
 
diff --git a/src/tables.jl b/src/tables.jl
index c18a85fb3..f788341ec 100644
--- a/src/tables.jl
+++ b/src/tables.jl
@@ -302,7 +302,7 @@ function WideDimTable(xs::Vararg{AbstractDimArray}; layernames=[Symbol("layer_$i
 end
 
 function WideDimTable(x::AbstractDimArray; layersfrom=nothing, mergedims=false)
-    if (layersfrom <: Dimension) && (any(isa.(dims(x), layersfrom)))
+    if !isnothing(layersfrom) && (layersfrom <: Dimension) && (any(isa.(dims(x), layersfrom)))
         nlayers = size(x, layersfrom)
         layers = [(@view x[layersfrom(i)]) for i in 1:nlayers]
         layernames = Symbol.(["$(dim2key(layersfrom))_$i" for i in 1:nlayers])
@@ -375,13 +375,6 @@ end
     else
         return dimarraycolumns(t)[i - 1]
     end
-    n_dimcols = length(dimcolumns(t))
-    i = findfirst(==(key), keys)
-    if i <= n_dimcols
-        return dimcolumns(t)[i]
-    else
-        return dimarraycolumns(t)[i - n_dimcols]
-    end
 end
 
 @inline function Tables.getcolumn(t::WideDimTable, ::Type{T}, i::Int, key::Symbol) where T