Same issue. Hardware/OS specs below:
Model Name:|iMac
Model Identifier:|iMac11,2
Processor Name:|Intel Core i3
Processor Speed:|3.06 GHz
Number of Processors:|1
Total Number of Cores:|2
L2 Cache (per Core):|256 KB
L3 Cache:|4 MB
Memory:|8 GB
Boot ROM Version:|99.0.0.0.0
SMC Version (system):|1.64f5
macOS High Sierra - Version 10.13.6