Werk #8940: mbg_lantime_ng_refclock: Fixed crash if field strength cannot be calculated

Component	Checks & agents
Title	mbg_lantime_ng_refclock: Fixed crash if field strength cannot be calculated
Date	Aug 22, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p22 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If mbgLtNgRefclockMaxStatusB (MBG-SNMP-LTNG-MIB) is zero the service crashed with a ZeroDivisionError while calculating field strength.

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