diff --git a/gns3server/controller/gns3vm/virtualbox_gns3_vm.py b/gns3server/controller/gns3vm/virtualbox_gns3_vm.py
index 9a656955..bef509dc 100644
--- a/gns3server/controller/gns3vm/virtualbox_gns3_vm.py
+++ b/gns3server/controller/gns3vm/virtualbox_gns3_vm.py
@@ -212,8 +212,11 @@ class VirtualBoxGNS3VM(BaseGNS3VM):
         List all VirtualBox VMs
         """
 
-        await self._check_requirements()
-        return await self._virtualbox_manager.list_vms()
+        try:
+            await self._check_requirements()
+            return await self._virtualbox_manager.list_vms()
+        except VirtualBoxError as e:
+            raise GNS3VMError("Could not list VirtualBox VMs: {}".format(str(e)))
 
     async def start(self):
         """
diff --git a/gns3server/controller/gns3vm/vmware_gns3_vm.py b/gns3server/controller/gns3vm/vmware_gns3_vm.py
index f061ff0a..a7a03e8e 100644
--- a/gns3server/controller/gns3vm/vmware_gns3_vm.py
+++ b/gns3server/controller/gns3vm/vmware_gns3_vm.py
@@ -115,6 +115,7 @@ class VMwareGNS3VM(BaseGNS3VM):
         """
         List all VMware VMs
         """
+
         try:
             return (await self._vmware_manager.list_vms())
         except VMwareError as e: