diff --git a/src/idl/dustem_write_fits_table.pro b/src/idl/dustem_write_fits_table.pro
index c20ea81..8049cfe 100755
--- a/src/idl/dustem_write_fits_table.pro
+++ b/src/idl/dustem_write_fits_table.pro
@@ -55,7 +55,11 @@ IF keyword_set(help) THEN BEGIN
 ENDIF
 
 ;===== run dustem to get predicted spectrum and sed
-dustem_predicted_sed=dustem_compute_sed(*(*!dustem_fit).current_param_values,out_st=dustem_spectra_st)
+IF ptr_valid((*!dustem_data).sed) THEN BEGIN
+	stop
+	dustem_predicted_sed=dustem_compute_sed(*(*!dustem_fit).current_param_values,out_st=dustem_spectra_st)
+ENDIF ELSE BEGIN
+ENDELSE
 
 IF !run_pol THEN BEGIN
 ;This is needed to compute Q,U of both SED and spectra
--
libgit2 0.21.2