diff --git a/check_pve.py b/check_pve.py
index 6bbc469..322d201 100755
--- a/check_pve.py
+++ b/check_pve.py
@@ -370,7 +370,7 @@ def checkVersion(self):
         if not data['version']:
             self.checkResult = NagiosState.UNKNOWN
             self.checkMessage = "Unable to determine pve version"
-        elif LooseVersion(self.options.min_version) > LooseVersion(data['version']):
+        elif self.options.min_version and LooseVersion(self.options.min_version) > LooseVersion(data['version']):
             self.checkResult = NagiosState.CRITICAL
             self.checkMessage = "Current pve version '{}' ({}) is lower than the min. required version '{}'".format(data['version'], data['repoid'], self.options.min_version)
         else: