diff --git a/camera/vdi_base/usb_camera/adapter/platform/v4l2/src/device_manager/v4l2_device_manager.cpp b/camera/vdi_base/usb_camera/adapter/platform/v4l2/src/device_manager/v4l2_device_manager.cpp
index c2f2dc2b674e24930d1ba117e5a116e36dac62e8..7f3eb83c64a21822bc63ced8f5e699e542ddcb7e 100644
--- a/camera/vdi_base/usb_camera/adapter/platform/v4l2/src/device_manager/v4l2_device_manager.cpp
+++ b/camera/vdi_base/usb_camera/adapter/platform/v4l2/src/device_manager/v4l2_device_manager.cpp
@@ -280,7 +280,7 @@ std::string V4L2DeviceManager::CameraIdToHardware(CameraId cameraId, ManagerId m
             return (*iter).hardwareName;
         }
     }
-    return nullptr;
+    return "";
 }
 
 CameraId V4L2DeviceManager::HardwareToCameraId(std::string hardwareName)