SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world.
And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download two short videos (registration required) highlighting:

System Workbench for STM32

java.lang.NullPointerException error


Can you update the IDE (Help > Check for Updates) then relaunch the Debug configuration.
If the problem persists or if you are already using the latest version available, please tell me how did you create your project (from System Workbench or from CubeMX (which version), which MCU).

Hope the update solve your issue.