Error with no clear message: bug in compiler?

[Martin Šošić]

Hi everybody,
I am new in ispc and I am getting this unusual error, I don't know what to do about it.
Compiler also writes message how I probably found a bug in compiler and should report it.
I don't know what to do about the error and was hoping somebody could help me.

This is the error message:
Ukkonen.ispc:61:6: Error: Assertion failed (ctx.cpp:2875): "pt != NULL || CastType<AtomicType>(valueType) != NULL".
        diagRecInfo.P[diagI] = parentInfo;
     ^^^^^^^^^^^^^^^^^^^^

I attached 2 source files, Ukkonen.ispc(that is where error happens) and Ukkonen_shared.h.

Snap of important code (for those don't want to read source):

// Structures
enum Cell {D, P, Q};
enum Direction {UP, LEFT, UPLEFT, CENTER};
struct ParentInfo {
    Cell cell;
    Direction direction;
};
struct RecDiagonalC {
    int length;
    ParentInfo *P, *D, *Q;
};

// main function
export void calcDiagParallel ( /* ... some variables ... */ , uniform RecDiagonalC &diagRecInfo /*output is stored into diagRecInfo*/) {
  /* .......
        some code
     ...... */

  ParentInfo parentInfo;
  foreach (diagI = 0 ... diag.size) {
      /* ......
            some code
        ........ */
     
      diagRecInfo.P[diagI] = parentInfo;    // This is where error occures, line 61
  
     /* ......
         some code
       ...... */
  }
}

Thank you!