C# .net program makes BricsCAD show a weird error

Dear forum, my problem is the following:
I wrote a BricsCAD plugin in C# .net that pulls information from an Excel file and updates the attributes of some blocks. It has no problems until I edit a big chunk of the excel file in one go.
My problem is that BricsCAD acts weird. It mostly shows an error, sometimes even crashes: "An error occurred while rendering entity 54C3B: Unknown error". Sadly I know, that this error is not thrown by my program, so I can't debug it as easily as if it was (I know it, because my program throws errors that look like "EXCEPTION: ...").
Anyone got any idea how I can get after this "Unknown error"?
Thanks!

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