diff --git a/tools/utils.py b/tools/utils.py
index 692cf36c6925b7368f6239c294b95bb63b846a9b..6dc56322a508c0e21e313662b377b94a3bcb04cf 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -245,7 +245,9 @@ def ProjectInfo(env):
     return proj
 
 def VersionCmp(ver1, ver2):
-    la = ver1.split('.')
+    la=[];
+    if ver1:
+        la = ver1.split('.')
     lb = ver2.split('.')
     f = 0
     if len(la) > len(lb):