diff --git a/tests/renderer/utils.py b/tests/renderer/utils.py
index 9a149bd7eac471391e70d507a8dbdd7b3d35f1b8..9942c3a175f7a68e2fbd7b46a2e4a49451a3a281 100644
--- a/tests/renderer/utils.py
+++ b/tests/renderer/utils.py
@@ -422,12 +422,15 @@ def binauralize_input_and_output(
         if not extended_md_used and n_obj > 0:
             truncated_meta_files = []
             for md in in_meta_files:
-                md_out_file = str(tmp_dir.joinpath(os.path.basename(md)))
-                with open(md_out_file, "w") as fp_out, open(md, "r") as fp_in:
-                    for line in fp_in:
-                        fp_out.write(
-                            ",".join(line.split(",")[:2]) + "\n"
-                        )  # Keep only first two elements: azim, elev
+                if md != "NULL":
+                    md_out_file = str(tmp_dir.joinpath(os.path.basename(md)))
+                    with open(md_out_file, "w") as fp_out, open(md, "r") as fp_in:
+                        for line in fp_in:
+                            fp_out.write(
+                                ",".join(line.split(",")[:2]) + "\n"
+                            )  # Keep only first two elements: azim, elev
+                else:
+                    md_out_file = "NULL" # Cannot truncate NULL, just insert it without modification
                 truncated_meta_files.append(md_out_file)
             in_meta_files = truncated_meta_files
 
@@ -456,6 +459,8 @@ def binauralize_input_and_output(
             in_fmt = "META"
 
         if "OSBA" in output_config or "OMASA" in output_config:
+            if "OSBA" in output_config:
+                output_config = output_config[:-1] + '3' # Temporary fix to handle than IVAS_dec produces HOA3 for all OSBA configs. Needs to be removed when this fix is ported to BASOP.
             scene_description_file(
                 output_config, scene_out, n_obj, dut_output_file, out_meta_files
             )