diff --git a/pydocstringformatter/_formatting/formatters_default.py b/pydocstringformatter/_formatting/formatters_default.py
index eccc6a4a..d397d75d 100644
--- a/pydocstringformatter/_formatting/formatters_default.py
+++ b/pydocstringformatter/_formatting/formatters_default.py
@@ -88,7 +88,8 @@ def treat_summary(
                 # ending quotes
                 line_length -= quotes_length + 1
 
-        summary_lines = summary.splitlines()
+        if not (summary_lines := summary.splitlines()):
+            summary_lines = [""]
 
         new_summary = "\n".join(
             textwrap.wrap(
diff --git a/tests/data/format/summary_splitter/empty_summary.args b/tests/data/format/summary_splitter/empty_summary.args
new file mode 100644
index 00000000..867f4488
--- /dev/null
+++ b/tests/data/format/summary_splitter/empty_summary.args
@@ -0,0 +1 @@
+--linewrap-full-docstring
diff --git a/tests/data/format/summary_splitter/empty_summary.py b/tests/data/format/summary_splitter/empty_summary.py
new file mode 100644
index 00000000..f78a2c42
--- /dev/null
+++ b/tests/data/format/summary_splitter/empty_summary.py
@@ -0,0 +1,2 @@
+class GithubIssue151:
+    """ """
diff --git a/tests/data/format/summary_splitter/empty_summary.py.out b/tests/data/format/summary_splitter/empty_summary.py.out
new file mode 100644
index 00000000..7284581c
--- /dev/null
+++ b/tests/data/format/summary_splitter/empty_summary.py.out
@@ -0,0 +1,2 @@
+class GithubIssue151:
+    """"""