Werk #2631: janitza_umg_freq: fixed crash when no frequency measurements were reported by the device

Component Checks & agents
Title janitza_umg_freq: fixed crash when no frequency measurements were reported by the device
Date Sep 24, 2015
Checkmk Version 1.2.7i3
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Affected Editions
1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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