diff --git a/gns3server/modules/dynamips/__init__.py b/gns3server/modules/dynamips/__init__.py
index bd1b15220..38aeac83a 100644
--- a/gns3server/modules/dynamips/__init__.py
+++ b/gns3server/modules/dynamips/__init__.py
@@ -473,31 +473,42 @@ class Dynamips(BaseManager):
                 if hasattr(vm, "set_{}".format(name)):
                     setter = getattr(vm, "set_{}".format(name))
                     yield from setter(value)
-
             elif name.startswith("slot") and value in ADAPTER_MATRIX:
                 slot_id = int(name[-1])
                 adapter_name = value
                 adapter = ADAPTER_MATRIX[adapter_name]()
-                if vm.slots[slot_id] and not isinstance(vm.slots[slot_id], type(adapter)):
-                    yield from vm.slot_remove_binding(slot_id)
-                if not isinstance(vm.slots[slot_id], type(adapter)):
-                    yield from vm.slot_add_binding(slot_id, adapter)
+                try:
+                    if vm.slots[slot_id] and not isinstance(vm.slots[slot_id], type(adapter)):
+                        yield from vm.slot_remove_binding(slot_id)
+                    if not isinstance(vm.slots[slot_id], type(adapter)):
+                        yield from vm.slot_add_binding(slot_id, adapter)
+                except IndexError:
+                    raise DynamipsError("Slot {} doesn't exist on this router".format(slot_id))
             elif name.startswith("slot") and value is None:
                 slot_id = int(name[-1])
-                if vm.slots[slot_id]:
-                    yield from vm.slot_remove_binding(slot_id)
+                try:
+                    if vm.slots[slot_id]:
+                        yield from vm.slot_remove_binding(slot_id)
+                except IndexError:
+                    raise DynamipsError("Slot {} doesn't exist on this router".format(slot_id))
             elif name.startswith("wic") and value in WIC_MATRIX:
                 wic_slot_id = int(name[-1])
                 wic_name = value
                 wic = WIC_MATRIX[wic_name]()
-                if vm.slots[0].wics[wic_slot_id] and not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
-                    yield from vm.uninstall_wic(wic_slot_id)
-                if not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
-                    yield from vm.install_wic(wic_slot_id, wic)
+                try:
+                    if vm.slots[0].wics[wic_slot_id] and not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
+                        yield from vm.uninstall_wic(wic_slot_id)
+                    if not isinstance(vm.slots[0].wics[wic_slot_id], type(wic)):
+                        yield from vm.install_wic(wic_slot_id, wic)
+                except IndexError:
+                    raise DynamipsError("WIC slot {} doesn't exist on this router".format(wic_slot_id))
             elif name.startswith("wic") and value is None:
                 wic_slot_id = int(name[-1])
-                if vm.slots[0].wics and vm.slots[0].wics[wic_slot_id]:
-                    yield from vm.uninstall_wic(wic_slot_id)
+                try:
+                    if vm.slots[0].wics and vm.slots[0].wics[wic_slot_id]:
+                        yield from vm.uninstall_wic(wic_slot_id)
+                except IndexError:
+                    raise DynamipsError("WIC slot {} doesn't exist on this router".format(wic_slot_id))
 
         mmap_support = self.config.get_section_config("Dynamips").getboolean("mmap_support", True)
         if mmap_support is False: