diff --git a/gns3server/modules/base_vm.py b/gns3server/modules/base_vm.py
index e7ea4d4d..b42930a5 100644
--- a/gns3server/modules/base_vm.py
+++ b/gns3server/modules/base_vm.py
@@ -403,7 +403,7 @@ class BaseVM:
         if path == "ubridge":
             path = shutil.which("ubridge")
 
-        if path is None:
+        if path is None or len(path) == 0:
             raise VMError("uBridge is not installed")
         return path