From 982eee7f311d49c86d6624eb28ea71fbe66e8742 Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Tue, 20 Jun 2023 15:34:11 -0700
Subject: [PATCH] libsysprof-analyze: return NULL if series is empty

---
 src/libsysprof-analyze/sysprof-time-series.c | 6 +++++-
 src/libsysprof-analyze/sysprof-xy-series.c   | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/libsysprof-analyze/sysprof-time-series.c b/src/libsysprof-analyze/sysprof-time-series.c
index 1f24233a..9ecb5fad 100644
--- a/src/libsysprof-analyze/sysprof-time-series.c
+++ b/src/libsysprof-analyze/sysprof-time-series.c
@@ -150,7 +150,11 @@ sysprof_time_series_get_values (const SysprofTimeSeries *self,
                                 guint                   *n_values)
 {
   *n_values = self->values->len;
-  return &g_array_index (self->values, SysprofTimeSeriesValue, 0);
+
+  if (self->values->len > 0)
+    return &g_array_index (self->values, SysprofTimeSeriesValue, 0);
+
+  return NULL;
 }
 
 static int
diff --git a/src/libsysprof-analyze/sysprof-xy-series.c b/src/libsysprof-analyze/sysprof-xy-series.c
index e6eb5a42..7399bc4c 100644
--- a/src/libsysprof-analyze/sysprof-xy-series.c
+++ b/src/libsysprof-analyze/sysprof-xy-series.c
@@ -169,7 +169,11 @@ sysprof_xy_series_get_values (const SysprofXYSeries *self,
                               guint                 *n_values)
 {
   *n_values = self->values->len;
-  return &g_array_index (self->values, SysprofXYSeriesValue, 0);
+
+  if (self->values->len > 0)
+    return &g_array_index (self->values, SysprofXYSeriesValue, 0);
+
+  return NULL;
 }
 
 static int