diff --git a/gns3server/compute/base_manager.py b/gns3server/compute/base_manager.py
index 17a41fe7e..a3ee38cec 100644
--- a/gns3server/compute/base_manager.py
+++ b/gns3server/compute/base_manager.py
@@ -221,6 +221,9 @@ class BaseManager:
         if not hasattr(destination_node, "working_dir"):
             return destination_node
 
+        if hasattr(source_node, "status") and source_node.status != "stopped":
+            raise ComputeError("Cannot duplicate node data while the node is running")
+ 
         destination_dir = destination_node.working_dir
         try:
             shutil.rmtree(destination_dir)
diff --git a/gns3server/compute/dynamips/__init__.py b/gns3server/compute/dynamips/__init__.py
index eae8ab61e..4362b9be1 100644
--- a/gns3server/compute/dynamips/__init__.py
+++ b/gns3server/compute/dynamips/__init__.py
@@ -478,36 +478,40 @@ class Dynamips(BaseManager):
                 adapter = ADAPTER_MATRIX[adapter_name]()
                 try:
                     if vm.slots[slot_id] and not isinstance(vm.slots[slot_id], type(adapter)):
-                        await vm.slot_remove_binding(slot_id)
+                        if vm.slots[slot_id].removable():
+                            await vm.slot_remove_binding(slot_id)
+                        else:
+                            log.warning(f"Slot {slot_id} on router '{vm.name}' has a non-removable adapter, skipping replacement")
+                            continue
                     if not isinstance(vm.slots[slot_id], type(adapter)):
                         await vm.slot_add_binding(slot_id, adapter)
                 except IndexError:
-                    raise DynamipsError(f"Slot {slot_id} doesn't exist on this router")
+                    log.warning(f"Slot {slot_id} doesn't exist on router '{vm.name}', skipping")
             elif name.startswith("slot") and (value is None or value == ""):
                 slot_id = int(name[-1])
                 try:
-                    if vm.slots[slot_id]:
+                    if vm.slots[slot_id] and vm.slots[slot_id].removable():
                         await vm.slot_remove_binding(slot_id)
                 except IndexError:
-                    raise DynamipsError(f"Slot {slot_id} doesn't exist on this router")
+                    log.warning(f"Slot {slot_id} doesn't exist on router '{vm.name}', skipping")
             elif name.startswith("wic") and value in WIC_MATRIX:
                 wic_slot_id = int(name[-1])
                 wic_name = value
                 wic = WIC_MATRIX[wic_name]()
                 try:
-                    if vm.slots[0].wics[wic_slot_id] and not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
+                    if vm.slots[0] and vm.slots[0].wics[wic_slot_id] and not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
                         await vm.uninstall_wic(wic_slot_id)
-                    if not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
+                    if vm.slots[0] and not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
                         await vm.install_wic(wic_slot_id, wic)
-                except IndexError:
-                    raise DynamipsError(f"WIC slot {wic_slot_id} doesn't exist on this router")
+                except (IndexError, AttributeError):
+                    log.warning(f"WIC slot {wic_slot_id} doesn't exist on router '{vm.name}', skipping")
             elif name.startswith("wic") and (value is None or value == ""):
                 wic_slot_id = int(name[-1])
                 try:
-                    if vm.slots[0].wics and vm.slots[0].wics[wic_slot_id]:
+                    if vm.slots[0] and vm.slots[0].wics and vm.slots[0].wics[wic_slot_id]:
                         await vm.uninstall_wic(wic_slot_id)
-                except IndexError:
-                    raise DynamipsError(f"WIC slot {wic_slot_id} doesn't exist on this router")
+                except (IndexError, AttributeError):
+                    log.warning(f"WIC slot {wic_slot_id} doesn't exist on router '{vm.name}', skipping")
 
         mmap_support = self.config.settings.Dynamips.mmap_support
         if mmap_support is False:
diff --git a/gns3server/controller/node.py b/gns3server/controller/node.py
index 37dcff665..ffd15a728 100644
--- a/gns3server/controller/node.py
+++ b/gns3server/controller/node.py
@@ -556,7 +556,7 @@ class Node:
         # None properties are not be sent because it can mean the emulator doesn't support it
         for key, value in list(data.items()):
             if value is None or value == {} or key in self.CONTROLLER_ONLY_PROPERTIES:
-                del value
+                del data[key]
 
         return data
 
diff --git a/gns3server/controller/project.py b/gns3server/controller/project.py
index e73602d54..98597649d 100644
--- a/gns3server/controller/project.py
+++ b/gns3server/controller/project.py
@@ -1280,9 +1280,6 @@ class Project:
         :returns: New node
         """
 
-        if node.status != "stopped" and not node.is_always_running():
-            raise ControllerError("Cannot duplicate node data while the node is running")
-
         data = copy.deepcopy(node.asdict(topology_dump=True))
         # Some properties like internal ID should not be duplicated
         for unique_property in (