I just had the same issue. And what solved it for me was a very curious attempt. I created a message box right before the assign, with the following command, and the Issue disappeared:
queueIt.SpecificContent.GetValueOrDefault(keyname).ToString
prashant1603765
ashokkarale
Anil_G
sharazkm32
sonaliaggarwal47
shivappa.katti1
lrtetala
V_Roboto_V
AZNI_SYAZWANI
Ranveer_S_Thakur