diff --git a/lib/jsonpath/parser.rb b/lib/jsonpath/parser.rb
index 84e0c47..94a28d1 100644
--- a/lib/jsonpath/parser.rb
+++ b/lib/jsonpath/parser.rb
@@ -99,6 +99,7 @@ def parse_exp(exp)
              elements.inject(@_current_node, &:__send__)
            end
 
+      return !el if operator&.strip == '!' && operand.nil?
       return (el ? true : false) if el.nil? || operator.nil?
 
       el = Float(el) rescue el
diff --git a/lib/jsonpath/version.rb b/lib/jsonpath/version.rb
index db0675c..8d16028 100644
--- a/lib/jsonpath/version.rb
+++ b/lib/jsonpath/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 class JsonPath
-  VERSION = '1.1.5'
+  VERSION = '1.1.6'
 end
diff --git a/test/test_jsonpath.rb b/test/test_jsonpath.rb
index 80fa0bb..30cffba 100644
--- a/test/test_jsonpath.rb
+++ b/test/test_jsonpath.rb
@@ -67,6 +67,7 @@ def test_recognize_array_comma
 
   def test_recognize_filters
     assert_equal [@object['store']['book'][2], @object['store']['book'][3]], JsonPath.new("$..book[?(@['isbn'])]").on(@object)
+    assert_equal [@object['store']['book'][0], @object['store']['book'][1], @object['store']['book'][4], @object['store']['book'][5], @object['store']['book'][6]], JsonPath.new("$..book[?(!@['isbn'])]").on(@object)
     assert_equal [@object['store']['book'][0], @object['store']['book'][2]], JsonPath.new("$..book[?(@['price'] < 10)]").on(@object)
     assert_equal [@object['store']['book'][0], @object['store']['book'][2]], JsonPath.new("$..book[?(@['price'] == 9)]").on(@object)
     assert_equal [@object['store']['book'][3]], JsonPath.new("$..book[?(@['price'] > 20)]").on(@object)
@@ -157,6 +158,7 @@ def test_paths_with_numbers
 
   def test_recognized_dot_notation_in_filters
     assert_equal [@object['store']['book'][2], @object['store']['book'][3]], JsonPath.new('$..book[?(@.isbn)]').on(@object)
+    assert_equal [@object['store']['book'][0], @object['store']['book'][1], @object['store']['book'][4], @object['store']['book'][5], @object['store']['book'][6]], JsonPath.new("$..book[?(!@.isbn)]").on(@object)
   end
 
   def test_works_on_non_hash