No source code when Step over (Roibert)

Dear forumConsider this 2 line, simulated on PIC32MZ, XC32 Compiler: 1) rtDW.h_Sa=-1.16;2) rtDW.C = ceil(rtDW.h_Sa); // ----> this line block the debug on step over Via simulator, when Debug the line 2) with Step Into, then no problem..i can continue next..