also do it for map

lib/liquid/standardfilters.rb

@@ -3,7 +3,6 @@
 require 'cgi'
 require 'base64'
 require 'bigdecimal'
-
 module Liquid
   module StandardFilters
     MAX_I32 = (1 << 31) - 1
@@ -537,6 +536,10 @@ module Liquid
     # @liquid_syntax array | map: string
     # @liquid_return [array[untyped]]
     def map(input, property)
+      if property.nil?
+        raise_property_error(property)
+      end
+
       property = Utils.to_s(property)
       InputIterator.new(input, context).map do |e|
         e = e.call if e.is_a?(Proc)
@@ -986,12 +989,15 @@ module Liquid
     attr_reader :context
 
     def filter_array(input, property, target_value, default_value = [], &block)
-      property = Liquid::Utils.to_s(property)
-      return default_value if property.empty?
-
       ary = InputIterator.new(input, context)
       return default_value if ary.empty?
 
+      if property.nil?
+        raise_property_error(property)
+      end
+
+      property = Liquid::Utils.to_s(property)
+
       block.call(ary) do |item|
         if target_value.nil?
           item[property]

lib/liquid/version.rb

@@ -2,5 +2,5 @@
 # frozen_string_literal: true
 
 module Liquid
-  VERSION = "5.8.2"
+  VERSION = "5.8.3"
 end

test/integration/standard_filter_test.rb

@@ -1033,6 +1033,24 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result(expected_output, template, { "array" => array })
   end
 
+  def test_where_with_empty_string_and_nil
+    array = [
+      "alpha",
+      "beta",
+      "gamma",
+    ]
+    template = "{{ array | where: '' | join: ' ' }}"
+    expected_output = "alpha beta gamma"
+    assert_template_result(expected_output, template, { "array" => array })
+
+    template = "{{ array | where: nil | join: ' ' }}"
+    exception = assert_raises(Liquid::ArgumentError) do
+      assert_template_result(expected_output, template, { "array" => array })
+    end
+
+    assert_equal("Liquid error (line 1): cannot select the property ''", exception.message)
+  end
+
   def test_where_with_value
     array = [
       { "handle" => "alpha", "ok" => true },