Openmodelica simulation of large model with OPC client connection crashes

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I am using OpenModelica 1.18.0~dev-259-g9ebba11 on Ubuntu 20.04.2 LTS 64bit and have developed a fluid system model that throws errors when simulating with the flags -embeddedServer=opc-ua -rt=0.1. Even though startup of the embedded opc server, connection to the UA Expert client and initialization all succeed, as soon as I set the "run"-variable to true, the process crashes:

Modelica model

UA Expert output

Modelica output

Unfortunately, I cannot make sense of the error output. If I remove a couple of components from the model (while trying to keep it as similar as possible), simulation magically runs just fine.

Modelica model that simulates just fine

Any ideas why this could happen, or where I could look for more debugging information?

I am grateful for any help.

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