From 79b4833fc66f4fb490a1291d392d5ef8bc2054e9 Mon Sep 17 00:00:00 2001
From: Maximilian Schmitt <mschmitt@audeering.com>
Date: Tue, 7 May 2024 18:06:28 +0200
Subject: [PATCH] fix if processing function returns empty table

---
 audinterface/core/segment.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/audinterface/core/segment.py b/audinterface/core/segment.py
index b6c0385..0e3071c 100644
--- a/audinterface/core/segment.py
+++ b/audinterface/core/segment.py
@@ -582,18 +582,21 @@ def process_table(
                 ends.extend(index.get_level_values("end") + start)
                 labels.extend([[table.iloc[j].values] * len(index)])
             labels = np.vstack(labels)
+            df_empty = False
             if labels.shape == (1, 0):
                 labels = labels.squeeze()
+                df_empty = True
 
         index = audformat.segmented_index(files, starts, ends)
 
         if isinstance(table, pd.Series):
             table = pd.Series(labels, index, name=table.name, dtype=dtype)
         else:
-            labels = {
-                col: labels[:, icol].astype(dtypes[icol])
-                for icol, col in enumerate(table.columns)
-            }
+            if not df_empty:
+                labels = {
+                    col: labels[:, icol].astype(dtypes[icol])
+                    for icol, col in enumerate(table.columns)
+                }
             table = pd.DataFrame(labels, index)
 
         return table