diff --git a/daemon/core/nodes/interface.py b/daemon/core/nodes/interface.py
index 3a5836af..b583d3a8 100644
--- a/daemon/core/nodes/interface.py
+++ b/daemon/core/nodes/interface.py
@@ -153,7 +153,8 @@ class CoreInterface:
         :param str addr: hardware address to set to.
         :return: nothing
         """
-        addr = utils.validate_mac(addr)
+        if addr is not None:
+            addr = utils.validate_mac(addr)
         self.hwaddr = addr
 
     def getparam(self, key: str) -> float:
diff --git a/daemon/core/utils.py b/daemon/core/utils.py
index 0d7e4a33..73e11cb8 100644
--- a/daemon/core/utils.py
+++ b/daemon/core/utils.py
@@ -440,6 +440,7 @@ def threadpool(
                 result = future.result()
                 results.append(result)
             except Exception as e:
+                logging.exception("thread pool exception")
                 exceptions.append(e)
     return results, exceptions