diff --git a/lisa/analysis/base.py b/lisa/analysis/base.py
index c2bfc1777962876b558c418723b9e885abce76b2..802ab228b3a73e2f5cba5c7b4c7f99f34109f0a5 100644
--- a/lisa/analysis/base.py
+++ b/lisa/analysis/base.py
@@ -1196,7 +1196,7 @@ class TraceAnalysisBase(AnalysisHelpers):
                     fmt=df_fmt,
                     index=(
                         ('Time' if 'Time' in df.columns else None)
-                        if index is None else
+                        if index is None and isinstance(df, (pl.LazyFrame, pl.DataFrame)) else
                         index
                     ),
                 )
diff --git a/lisa/analysis/rta.py b/lisa/analysis/rta.py
index fc70e31a1fd45d3edb534350ee6b1f2270c13436..428e63a05ab4669a7578c39d3e8145d1efd671ab 100644
--- a/lisa/analysis/rta.py
+++ b/lisa/analysis/rta.py
@@ -322,6 +322,7 @@ class RTAEventsAnalysis(TraceAnalysisBase):
             .reset_index()
             .set_index([col for col in kept_cols if col != 'properties'])
         )
+        df.index.name = 'phases'
 
         return df
 
diff --git a/lisa/analysis/tasks.py b/lisa/analysis/tasks.py
index ca4468063ac49f58ec391ad3f5e6ba6628e24b29..44399533ee603652af284768bd0b4fc4c91a3f9a 100644
--- a/lisa/analysis/tasks.py
+++ b/lisa/analysis/tasks.py
@@ -427,7 +427,7 @@ class TasksAnalysis(TraceAnalysisBase):
         def comm_to_pid(comm):
             try:
                 pid_list = self._task_name_map[comm]
-            except IndexError:
+            except KeyError:
                 # pylint: disable=raise-missing-from
                 raise ValueError(f'trace does not have any task named "{comm}"')
 
@@ -436,7 +436,7 @@ class TasksAnalysis(TraceAnalysisBase):
         def pid_to_comm(pid):
             try:
                 comm_list = self._task_pid_map[pid]
-            except IndexError:
+            except KeyError:
                 # pylint: disable=raise-missing-from
                 raise ValueError(f'trace does not have any task PID {pid}')
 
diff --git a/lisa/tests/base.py b/lisa/tests/base.py
index fb34b7a58ac581037039b1bf697daa080bfecfd4..e3b97f9e9fbe2ffcacc40605d1d1932adc69d422 100644
--- a/lisa/tests/base.py
+++ b/lisa/tests/base.py
@@ -1793,7 +1793,10 @@ class RTATestBundle(FtraceTestBundle, DmesgTestBundle):
             # Find out which task(s) this threshold is about
             if isinstance(key, str):
                 comms = df.loc[df['comm'].str.match(key), 'comm']
-                task_ids = comms.apply(self.trace.ana.tasks.get_task_id)
+                task_ids = [
+                    self.trace.ana.tasks.get_task_id(comm)
+                    for comm in comms
+                ]
             else:
                 # Use update=False to let None fields propagate, as they are
                 # used to indicate a "dont care" value
diff --git a/lisa/trace.py b/lisa/trace.py
index 91956daf6d1f263f7706d73a3e2703d373a46ea0..82ddcc239cac9cf6a24abbd04763ff17b192a238 100644
--- a/lisa/trace.py
+++ b/lisa/trace.py
@@ -3205,7 +3205,21 @@ class _WindowTraceView(_TraceViewBase):
         compress_signals_init=None,
     ):
         super().__init__(trace)
-        self._window = window
+
+        def fixup_window(window):
+            if window:
+                start, end = window
+                if start is not None:
+                    start = Timestamp(start, rounding='down')
+
+                if end is not None:
+                    end = Timestamp(end, rounding='up')
+
+                return (start, end)
+            else:
+                return None
+
+        self._window = fixup_window(window)
         self._signals = set(signals or [])
         self._compress_signals_init = compress_signals_init