diff --git a/AUTHORS b/AUTHORS
index 203454d3..87c17ca3 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -99,3 +99,4 @@ Thanks to the following, who submitted detailed bug reports and excellent sugges
   varac
   xerus2000
   Rafael Oliveira
+  agentcoffee
diff --git a/ChangeLog b/ChangeLog
index c9a65fd5..4c69329b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -17,6 +17,8 @@
 - #470    Do not leak filter in IntervalFilterFirstOf
           (thanks to Shaun Ruffel)
 - #474    Make display of ids and annotations in summary report configurable
+- #491    Tracking an interval in the future while actively tracking time results in a database inconsistency
+          (thanks to agentcoffee)
 
 ------ current release ---------------------------
 
diff --git a/src/commands/CmdSummary.cpp b/src/commands/CmdSummary.cpp
index e77abb8e..6b233d9a 100644
--- a/src/commands/CmdSummary.cpp
+++ b/src/commands/CmdSummary.cpp
@@ -122,9 +122,11 @@ int CmdSummary (
   auto days_start = filter.is_started() ? filter.start : tracked.front ().start;
   auto days_end   = filter.is_ended()   ? filter.end   : tracked.back ().end;
 
+  const auto now = Datetime ();
+
   if (days_end == 0)
   {
-    days_end = Datetime ();
+    days_end = now;
   }
 
   for (Datetime day = days_start.startOfDay (); day < days_end; ++day)
@@ -136,7 +138,7 @@ int CmdSummary (
     for (auto& track : subset (day_range, tracked))
     {
       // Make sure the track only represents one day.
-      if ((track.is_open () && day > Datetime ()))
+      if ((track.is_open () && day > now))
         continue;
 
       row = table.addRow ();
@@ -145,14 +147,22 @@ int CmdSummary (
       {
         table.set (row, 0, format ("W{1}", day.week ()));
         table.set (row, 1, day.toString ("Y-M-D"));
-        table.set (row, 2, day.dayNameShort (day.dayOfWeek ()));
+        table.set (row, 2, Datetime::dayNameShort (day.dayOfWeek ()));
         previous = day;
       }
 
+
       // Intersect track with day.
       auto today = day_range.intersect (track);
-      if (track.is_open () && day <= Datetime () && today.end > Datetime ())
-        today.end = Datetime ();
+
+      if (track.is_open() && track.start > now)
+      {
+        today.end = track.start;
+      }
+      else if (track.is_open () && day <= now && today.end > now)
+      {
+        today.end = now;
+      }
 
       std::string tags = join(", ", track.tags());
 
@@ -173,11 +183,13 @@ int CmdSummary (
         table.set (row, (show_ids ? 5 : 4), annotation);
       }
 
+      const auto total = today.total ();
+      
       table.set (row, (show_ids ? 5 : 4) + offset, today.start.toString ("h:N:S"));
       table.set (row, (show_ids ? 6 : 5) + offset, (track.is_open () ? "-" : today.end.toString ("h:N:S")));
-      table.set (row, (show_ids ? 7 : 6) + offset, Duration (today.total ()).formatHours ());
+      table.set (row, (show_ids ? 7 : 6) + offset, Duration (total).formatHours ());
 
-      daily_total += today.total ();
+      daily_total += total;
     }
 
     if (row != -1)
diff --git a/src/helper.cpp b/src/helper.cpp
index 901de476..cdb103e0 100644
--- a/src/helper.cpp
+++ b/src/helper.cpp
@@ -111,10 +111,20 @@ std::string intervalSummarize (const Rules& rules, const Interval& interval)
     // Interval open.
     if (interval.is_open ())
     {
-      out << "Tracking " << tags << '\n'
-          << "  Started " << interval.start.toISOLocalExtended () << '\n'
-          << "  Current " << minimalDelta (interval.start, Datetime ()) << '\n'
-          << "  Total   " << std::setw (19) << std::setfill (' ') << total.formatHours () << '\n';
+      auto now = Datetime ();
+
+      if (interval.start <= now )
+      {
+        out << "Tracking " << tags << '\n'
+            << "  Started " << interval.start.toISOLocalExtended () << '\n'
+            << "  Current " << minimalDelta (interval.start, now) << '\n'
+            << "  Total   " << std::setw (19) << std::setfill (' ') << total.formatHours () << '\n';
+      }
+      else
+      {
+        out << "Tracking " << tags << '\n'
+            << "  Starting " << interval.start.toISOLocalExtended () << '\n';
+      }
     }
 
     // Interval closed.