diff --git a/lisa/analysis/tasks.py b/lisa/analysis/tasks.py
index 5033aa24c00d4c72b07609ba427d96b014ec4e8d..7ce3aeed1aadecd2fb97506f4ef06405cee5fcaa 100644
--- a/lisa/analysis/tasks.py
+++ b/lisa/analysis/tasks.py
@@ -1144,30 +1144,34 @@ class TasksAnalysis(TraceAnalysisBase):
                 df['active'] *= df['duty_cycle']
 
             data = make_rect_df(df[df['active'] != 0])
-            name_df = self.trace.df_event('sched_switch')
-            name_df = name_df[name_df['next_pid'] == task.pid]
-            names = name_df['next_comm'].reindex(data.index, method='ffill')
-
-            # If there was no sched_switch with next_pid matching task.pid, we
-            # simply take the last known name of the task, which could
-            # originate from another field or another event.
-            #
-            # Note: This prevents an <NA> value, which makes bokeh choke.
-            last_comm = self.trace.get_task_pid_names(task.pid)[-1]
-            if last_comm not in names.cat.categories:
-                names = names.cat.add_categories([last_comm])
-            names = names.fillna(last_comm)
-
-            # Use a string for PID so that holoviews interprets it as
-            # categorical variable, rather than continuous. This is important
-            # for correct color mapping
-            data['pid'] = str(task.pid)
-            data['comm'] = names
-            data['start'] = data.index
-            data['cpu'] = df['cpu']
-            data['duration'] = df['duration']
-            data['duty_cycle'] = df['duty_cycle']
-            return data
+            if data.empty:
+                return data
+            else:
+                name_df = self.trace.df_event('sched_switch')
+                name_df = name_df[name_df['next_pid'] == task.pid]
+                names = name_df['next_comm'].reindex(data.index, method='ffill')
+
+                # If there was no sched_switch with next_pid matching task.pid, we
+                # simply take the last known name of the task, which could
+                # originate from another field or another event.
+                #
+                # Note: This prevent an <NA> value, which makes bokeh choke.
+                last_comm = self.trace.get_task_pid_names(task.pid)[-1]
+
+                if last_comm not in names.cat.categories:
+                    names = names.cat.add_categories([last_comm])
+                names = names.fillna(last_comm)
+
+                # Use a string for PID so that holoviews interprets it as
+                # categorical variable, rather than continuous. This is important
+                # for correct color mapping
+                data['pid'] = str(task.pid)
+                data['comm'] = names
+                data['start'] = data.index
+                data['cpu'] = df['cpu']
+                data['duration'] = df['duration']
+                data['duty_cycle'] = df['duty_cycle']
+                return data
 
         def plot_rect(data):
             if show_legend: