diff --git a/homeassistant/components/roomba/config_flow.py b/homeassistant/components/roomba/config_flow.py
index 8cee43ab4aa..d690bcce978 100644
--- a/homeassistant/components/roomba/config_flow.py
+++ b/homeassistant/components/roomba/config_flow.py
@@ -130,7 +130,9 @@ class RoombaConfigFlow(ConfigFlow, domain=DOMAIN):
         # going for a longer hostname we abort so the user
         # does not see two flows if discovery fails.
         for progress in self._async_in_progress():
-            flow_unique_id: str = progress["context"]["unique_id"]
+            flow_unique_id = progress["context"].get("unique_id")
+            if not flow_unique_id:
+                continue
             if flow_unique_id.startswith(self.blid):
                 return self.async_abort(reason="short_blid")
             if self.blid.startswith(flow_unique_id):
diff --git a/tests/components/roomba/test_config_flow.py b/tests/components/roomba/test_config_flow.py
index e5f882afa36..8139e42d43d 100644
--- a/tests/components/roomba/test_config_flow.py
+++ b/tests/components/roomba/test_config_flow.py
@@ -1055,6 +1055,43 @@ async def test_dhcp_discovery_partial_hostname(hass: HomeAssistant) -> None:
     assert current_flows[0]["flow_id"] == result2["flow_id"]
 
 
+async def test_dhcp_discovery_when_user_flow_in_progress(hass: HomeAssistant) -> None:
+    """Test discovery flow when user flow is in progress."""
+
+    # Start a DHCP flow
+    with patch(
+        "homeassistant.components.roomba.config_flow.RoombaDiscovery", _mocked_discovery
+    ):
+        result = await hass.config_entries.flow.async_init(
+            DOMAIN, context={"source": SOURCE_USER}
+        )
+        await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+
+    # Start a user flow - unique ID not set
+    with patch(
+        "homeassistant.components.roomba.config_flow.RoombaDiscovery", _mocked_discovery
+    ):
+        result2 = await hass.config_entries.flow.async_init(
+            DOMAIN,
+            context={"source": SOURCE_DHCP},
+            data=dhcp.DhcpServiceInfo(
+                ip=MOCK_IP,
+                macaddress="aabbccddeeff",
+                hostname="irobot-blidthatislonger",
+            ),
+        )
+        await hass.async_block_till_done()
+
+    assert result2["type"] is FlowResultType.FORM
+    assert result2["step_id"] == "link"
+
+    current_flows = hass.config_entries.flow.async_progress()
+    assert len(current_flows) == 2
+
+
 async def test_options_flow(
     hass: HomeAssistant,
 ) -> None: