diff --git a/data_processor.py b/data_processor.py
index 50070d41..ebc4291f 100644
--- a/data_processor.py
+++ b/data_processor.py
@@ -418,6 +418,10 @@ class DataProcessor:
                             additional_info_for_af_col = f"INFO: Wiki-URL von Parent (D): {parent_account_name_d}. "
                         else:
                             additional_info_for_af_col = f"WARN: Kein Wiki für Parent D '{parent_account_name_d}' gefunden. "
+                    # NEU: Spezifischere Fehlerbehandlung
+                    except ValueError as e_val:
+                        self.logger.error(f"Fehler bei Wiki-Suche (Parent D): {e_val}")
+                        additional_info_for_af_col = f"ERR: Suche Parent D fehlgeschlagen (ValueError). "
                     except Exception as e_d_lookup:
                         self.logger.error(
                             f"Fehler bei Wiki-Suche für Parent D '{parent_account_name_d}': {e_d_lookup}")