diff --git a/tools/utils.py b/tools/utils.py
index 692cf36c69..6dc56322a5 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):