Fitfunc report only for fit convergence

function/WAVE PeakFitRatios(Mask, enA, widthA, enB, widthB)  
    Wave Mask
    variable enA, widthA, enB, widthB
    
    wave/Z cube
    wave/Z M_Groups
    
    if(!WaveExists(cube) || !WaveExists(M_Groups))
        return $""
    endif
    
    variable timer = StartMStimer
    
    variable rows = DimSize(M_Groups, 0)
    variable cols = DimSize(M_Groups, 1)
    Make/D/O/N=(rows, cols) M_Ratio = NaN
    
    //SET CURVE FIT OPTIONS
    variable/G V_FitOptions = 4
    variable/G V_FitError = 0
    variable ErrorCount = 0
    
    // set the energy/channel ranges over which the gaussian peaks are fitted 
    variable lowA = enA - widthA
    variable highA = enA + widthA
    variable lowB = enB - widthB
    variable highB = enB + widthB
    
    variable i,j, PeakA, PeakB
    for (i=0; i<cols; i+=1)
        for (j=0; j<rows; j+=1)
        
            if (mask[j][i])             // fit pixel if M_Mask is 1
                    // Extract spectrum from cube and scale energy
                    MatrixOP/O spec = beam(cube, j, i)
                    wave spec
                    SetScale/P x 0, 0.01, spec
                    
                    try         
                        // fit first peak
                        K0 = 0; K2 = enA
                        CurveFit/Q/H="1010"/NTHR=0 gauss spec(lowA,highA) /D; AbortOnRTE
                        wave peak = $"fit_Spec"
                        PeakA = area(peak) 
                    
                        // fit second peak
                        K0 = 0; K2 = enB
                        CurveFit/Q/H="1010"/NTHR=0 gauss spec(lowB,highB) /D;  AbortOnRTE
                        PeakB = area(peak) 
                    
                        M_Ratio[j][i] = PeakA/PeakB 
                    
                    catch 
                        if (V_AbortCode == -4)
                            ErrorCount +=1
                            variable CFerror = GetRTError(1)
                            printf "Curve fit error at coordinate %g, %g: %s\r", j, i, GetErrMessage(CFError)
                            M_Ratio[j][i] =NaN
                        endif
                    endtry
            endif
            
        endfor
    endfor
 
    // clean up
    KillWaves/Z W_coef, W_sigma, Spec, fit_Spec
    printf "%g pixels not fitted due to CurveFit errors.\r", errorcount
    Printf "Time: %g seconds \r", stopMStimer(timer)/1e6
    
    return M_Ratio
end

Variable V_FitError = 0
Variable V_FitQuitReason = 0
FuncFit ...
if (V_FitError)
    ... handle error such as singular matrix ...
endif
if (V_FitQuitReason == 1)       // max iterations without convergence
    ... do something about it ...
endif