Error in addon with null b.net

gistfile1.txt

Date: 2020-05-09 16:12:41
ID: 1
Error occured in: Global
Count: 1
Message: ...nterface\AddOns\EMA-Classic\Modules\Talk-Classic.lua line 719:
   attempt to concatenate a nil value
Debug:
   ...nterface\AddOns\EMA-Classic\Modules\Talk-Classic.lua:719: ForwardWhisperToMaster()
   ...nterface\AddOns\EMA-Classic\Modules\Talk-Classic.lua:664: ?()
   ...ibDataBroker\CallbackHandler\CallbackHandler-1.0.lua:119:
      ...ibDataBroker\CallbackHandler\CallbackHandler-1.0.lua:119
   [C]: ?
   ...ibDataBroker\CallbackHandler\CallbackHandler-1.0.lua:29:
      ...ibDataBroker\CallbackHandler\CallbackHandler-1.0.lua:25
   ...ibDataBroker\CallbackHandler\CallbackHandler-1.0.lua:64: Fire()
   ...ddOns\EMA-Classic\Libs\AceEvent-3.0\AceEvent-3.0.lua:120:
      ...ddOns\EMA-Classic\Libs\AceEvent-3.0\AceEvent-3.0.lua:119
Locals:
None
AddOns:
  Swatter, v8.2.6377 (SwimmingSeadragon)
  AucAdvanced, v8.2.6430 (SwimmingSeadragon)
  AucFilterBasic, v8.2.6364 (SwimmingSeadragon)
  AucScanData, v8.2.6365 (SwimmingSeadragon)
  AucStatHistogram, v8.2.6366 (SwimmingSeadragon)
  AucStatiLevel, v8.2.6370 (SwimmingSeadragon)
  AucStatPurchased, v8.2.6367 (SwimmingSeadragon)
  AucStatSimple, v8.2.6399 (SwimmingSeadragon)
  AucStatStdDev, v8.2.6369 (SwimmingSeadragon)
  AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)
  BeanCounter, v8.2.6434 (SwimmingSeadragon)
  Clique, vv1.0.3-classic
  EMAClassic, vv1.13.2-Release-v0.6(121022)
  Enchantrix, v8.2.6428 (SwimmingSeadragon)
  EnchantrixBarker, v8.2.6469 (SwimmingSeadragon)
  GatherMate2, v1.45.5
  Informant, v8.2.6374 (SwimmingSeadragon)
  ISBoxer, v1.0
  Questie, v5.8.0 0 d9d2117b
  SlideBar, v8.2.6375 (SwimmingSeadragon)
  Stubby, v8.2.6376 (SwimmingSeadragon)
  BlizRuntimeLib_enUS v1.13.4.11304 <none>
  (ck=38f)