diff --git a/haystack/pipelines/base.py b/haystack/pipelines/base.py
index 2e2103e12..651a840cc 100644
--- a/haystack/pipelines/base.py
+++ b/haystack/pipelines/base.py
@@ -1470,7 +1470,7 @@ class Pipeline:
                 df_answers = pd.DataFrame()
                 answers = node_output.get(field_name, None)
                 if answers is not None:
-                    if isinstance(answers[i], list):
+                    if i < len(answers) and isinstance(answers[i], list):
                         # answers_isolated refers to only one relevant document and thus only a list of answers
                         # answers refers to multiple relevant documents and thus multiple lists of lists of answers
                         answers = answers[i]
@@ -1607,7 +1607,7 @@ class Pipeline:
                 df_docs = pd.DataFrame()
                 documents = node_output.get(field_name, None)
                 if documents is not None:
-                    if isinstance(documents[i], list):
+                    if i < len(documents) and isinstance(documents[i], list):
                         documents = documents[i]
                     if len(documents) == 0:
                         # add dummy document if there was no document retrieved, so query does not get lost in dataframe