diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 73b5526f..89277ff2 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -3,6 +3,12 @@
 Change Log
 ==========
 
+5.4.3
+=====
+
+* Fix bug when parsing output from top command
+
+
 5.4.2
 =====
 
diff --git a/pyproject.toml b/pyproject.toml
index 55d6e95c..1701cf84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "tibanna"
-version = "5.4.2"
+version = "5.4.3"
 description = "Tibanna runs portable pipelines (in CWL/WDL) on the AWS Cloud."
 authors = ["4DN-DCIC Team <support@4dnucleome.org>"]
 license = "MIT"
diff --git a/tibanna/top.py b/tibanna/top.py
index 2a90a42c..2bcefb77 100644
--- a/tibanna/top.py
+++ b/tibanna/top.py
@@ -93,7 +93,9 @@ def parse_contents(self, contents):
         is_in_table = False
         for line in contents.splitlines():
             if line.startswith('Timestamp:'):
-                timestamp = line.split()[1]
+                line_split = line.split()
+                if len(line_split) > 1:
+                    timestamp = line_split[1]
                 continue
             if line.lstrip().startswith('PID'):
                 is_in_table = True