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-rwxr-xr-xsrc/conf_mode/interfaces-wirelessmodem.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/conf_mode/interfaces-wirelessmodem.py b/src/conf_mode/interfaces-wirelessmodem.py
index 7d8110096..2da1f0863 100755
--- a/src/conf_mode/interfaces-wirelessmodem.py
+++ b/src/conf_mode/interfaces-wirelessmodem.py
@@ -56,7 +56,8 @@ def verify(wwan):
# we can not use isfile() here as Linux device files are no regular files
# thus the check will return False
- if not os.path.exists(find_device_file(wwan['device'])):
+ dev_path = find_device_file(wwan['device'])
+ if dev_path is None or not os.path.exists(dev_path):
raise ConfigError('Device "{device}" does not exist'.format(**wwan))
verify_vrf(wwan)