[BUG] Convert LALDict to python dictionary before saving

bilby/core/result.py

@@ -747,6 +747,18 @@ def _get_save_data_dictionary(self):
         for attr in save_attrs:
             try:
                 dictionary[attr] = getattr(self, attr)
+                if (attr == "meta_data") and (
+                    "lal_waveform_dictionary"
+                    in dictionary[attr]["likelihood"]["waveform_arguments"]["lal_waveform_dictionary"]
+                ):
+                    from ..gw.utils import gwsignal_from_lal_dict
+
+                    dictionary[attr]["likelihood"]["waveform_arguments"][
+                        "lal_waveform_dictionary"
+                    ] = gwsignal_from_lal_dict(
+                        dictionary[attr]["likelihood"]["waveform_arguments"]["lal_waveform_dictionary"]
+                    )
+
             except ValueError as e:
                 logger.debug("Unable to save {}, message: {}".format(attr, e))
                 pass

bilby/gw/utils.py

@@ -1073,3 +1073,22 @@ def calculate_time_to_merger(frequency, mass_1, mass_2, chi=0, safety=1.1):
         chi,
         -1
     )
+
+
+def gwsignal_from_lal_dict(ldict):
+    """
+    Convert LALDict object to a Python dictionary
+
+    Parameters
+    ==========
+    ldict: LALDict
+        LALDict object
+
+    Returns
+    =======
+    d: dict
+        Python dictionary
+    """
+    from lalsimulation.gwsignal.core.utils import from_lal_dict
+
+    return from_lal_dict(ldict)