outdxf: fix dxf_classes_write with no classes

Fixes GH #1068
LibreDWG · Feb 25, 2025 · 8c1f67d · 8c1f67d
1 parent 17d78ce
commit 8c1f67d
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/src/out_dxf.c b/src/out_dxf.c
@@ -3808,8 +3808,9 @@ dwg_write_dxf (Bit_Chain *restrict dat, Dwg_Data *restrict dwg)
       if ((dat->from_version >= R_13b1 && dwg->num_classes)
           || dat->version >= R_2000)
         {
-          if (dxf_classes_write (dat, dwg) >= DWG_ERR_CRITICAL)
-            goto fail;
+          if (dwg->num_classes) // GH #1068
+            if (dxf_classes_write (dat, dwg) >= DWG_ERR_CRITICAL)
+              goto fail;
         }
       SINCE (R_2_0)
       {