diff --git a/src/pendulum/parsing/__init__.py b/src/pendulum/parsing/__init__.py
index 761f52c5..3dc9dd01 100644
--- a/src/pendulum/parsing/__init__.py
+++ b/src/pendulum/parsing/__init__.py
@@ -212,6 +212,10 @@ def _parse_iso8601_interval(text: str) -> _Interval:
         raise ParserError("Invalid interval")
 
     first, last = text.split("/")
+
+    if not first or not last:
+        raise ParserError("Invalid interval.")
+
     start = end = duration = None
 
     if first[0] == "P":
diff --git a/tests/parsing/test_parsing_duration.py b/tests/parsing/test_parsing_duration.py
index ab8b9920..d6a0b73d 100644
--- a/tests/parsing/test_parsing_duration.py
+++ b/tests/parsing/test_parsing_duration.py
@@ -293,6 +293,14 @@ def test_parse_duration_invalid():
         parse("P1Dasdfasdf")
 
 
+def test_parse_interval_invalid():
+    with pytest.raises(ParserError):
+        parse("/no_start")
+
+    with pytest.raises(ParserError):
+        parse("no_end/")
+
+
 def test_parse_duration_fraction_only_allowed_on_last_component():
     with pytest.raises(ParserError):
         parse("P2Y3M4DT5.5H6M7S")