diff --git a/e2e/slack/test_accessbot_slack_access.py b/e2e/slack/test_accessbot_slack_access.py
index 89bb976..2fc9446 100644
--- a/e2e/slack/test_accessbot_slack_access.py
+++ b/e2e/slack/test_accessbot_slack_access.py
@@ -225,6 +225,14 @@ def test_access_command_grant_with_strange_casing(self, mocked_testbot):
         assert "access request" in mocked_testbot.pop_message()
         assert "Granting" in mocked_testbot.pop_message()
 
+    def test_access_command_fails_when_duplicating_request(self, mocked_testbot):
+        mocked_testbot.push_message(f"access to {resource_name}")
+        mocked_testbot.push_message(f"access to {resource_name}")
+        assert "valid request" in mocked_testbot.pop_message()
+        assert "access request" in mocked_testbot.pop_message()
+        assert "already have a pending grant request" in mocked_testbot.pop_message()
+
+
 class Test_access_flow_from_access_form(ErrBotExtraTestSettings):
     @pytest.fixture
     def mocked_testbot(self, testbot):
diff --git a/plugins/sdm/accessbot.py b/plugins/sdm/accessbot.py
index a52cf94..669369b 100644
--- a/plugins/sdm/accessbot.py
+++ b/plugins/sdm/accessbot.py
@@ -183,6 +183,7 @@ def access_resource(self, message, match):
         try:
             self.get_arguments_helper().check_required_flags(flags_validators.keys(), self.config['REQUIRED_FLAGS'], flags)
             self.check_requester_flag(message, flags.get('requester'))
+            self.__grant_requests_helper.check_request_already_exists(resource_name, GrantRequestType.ACCESS_RESOURCE, message.frm.person)
         except Exception as e:
             yield str(e)
             return
@@ -198,6 +199,11 @@ def assign_role(self, message, match):
             return
         self.__metrics_helper.increment_access_requests()
         role_name = re.sub(ASSIGN_ROLE_REGEX, "\\1", match.string.replace("*", ""), flags=re.IGNORECASE)
+        try:
+            self.__grant_requests_helper.check_request_already_exists(role_name, GrantRequestType.ASSIGN_ROLE, message.frm.person)
+        except Exception as e:
+            yield str(e)
+            return
         yield from self.get_role_grant_helper().request_access(message, role_name)
         self.__metrics_helper.reset_consecutive_errors()
 
diff --git a/plugins/sdm/lib/helper/grant_request_helper.py b/plugins/sdm/lib/helper/grant_request_helper.py
index 06dc8b1..9eb88c6 100644
--- a/plugins/sdm/lib/helper/grant_request_helper.py
+++ b/plugins/sdm/lib/helper/grant_request_helper.py
@@ -113,6 +113,14 @@ def remove(self, request_id: str):
         self.__grant_requests.pop(request_id, None)
         self.save_state()
 
+    def check_request_already_exists(self, sdm_object_name: str, grant_request_type: GrantRequestType, user: str):
+        for grant_request in self.__grant_requests.values():
+            if grant_request["type"] == grant_request_type.value and grant_request["message"].frm.person == user \
+                    and grant_request["sdm_object"].name.lower() == sdm_object_name.lower():
+                obj_type_name = "resource" if grant_request_type == GrantRequestType.ACCESS_RESOURCE else "role"
+                raise Exception(
+                    f"You already have a pending grant request for that {obj_type_name}. Please, wait for an admin evaluation.")
+
     def __sdm_model_to_dict(self, object):
         return object if type(object) is dict else object.to_dict()
 
diff --git a/plugins/sdm/lib/helper/test_grant_request_helper.py b/plugins/sdm/lib/helper/test_grant_request_helper.py
index 3e987ab..fb448e5 100644
--- a/plugins/sdm/lib/helper/test_grant_request_helper.py
+++ b/plugins/sdm/lib/helper/test_grant_request_helper.py
@@ -60,6 +60,25 @@ def test_restore_state_when_has_stored_requests(self):
                 assert helper.get(request_id) is None
                 assert not helper.exists(request_id)
 
+    def test_raise_exception_when_add_duplicated_request(self):
+        with patch("os.path.isfile") as mock_isfile:
+            mock_isfile.side_effect = [True]
+            bot = get_mocked_bot()
+            with patch("builtins.open", mock_open(read_data=mocked_file_data)) as handle:
+                helper = GrantRequestHelper(bot)
+                assert helper.get(request_id) is not None
+                assert helper.exists(request_id)
+                assert len(helper.get_request_ids()) == 1
+                file = handle()
+                file.read.assert_called_once()
+                with pytest.raises(Exception) as e:
+                    helper.add(request_id, get_mocked_message(), get_mock_sdm_object(), get_mock_sdm_account(),
+                               GrantRequestType.ACCESS_RESOURCE)
+                    assert "already have a pending grant request" in e.value
+                helper.remove(request_id)
+                assert helper.get(request_id) is None
+                assert not helper.exists(request_id)
+
     def test_dont_restore_state_when_has_stored_requests_and_is_disabled(self):
         with patch("os.path.isfile") as mock_isfile:
             mock_isfile.side_effect = [True]