diff --git a/moderation/moderation.py b/moderation/moderation.py
index 8fe82b5..3e72219 100644
--- a/moderation/moderation.py
+++ b/moderation/moderation.py
@@ -1782,19 +1782,22 @@ class Moderation(commands.Cog):
             file = await self.ctx.message.attachments[0].read()
             data = sorted(json.loads(file), key=lambda x: x['case'])
 
+            failed_cases = []
+
             for case in data:
                 if case['type'] not in accepted_types:
                     continue
 
                 timestamp = round(case['timestamp'] / 1000)
 
-                if case['duration'] is not None:
-                    try:
+                try:
+                    if case['duration'] is not None and float(case['duration']) != 0:
                         duration = timedelta(seconds=round(float(case['duration']) / 1000))
-                    except OverflowError:
+                    else:
+                        duration = 'NULL'
+                except OverflowError:
+                        failed_cases.append(case['case'])
                         continue
-                else:
-                    duration = 'NULL'
 
                 if case['resolved']:
                     resolved = 1
@@ -1852,6 +1855,8 @@ class Moderation(commands.Cog):
                 )
 
             await interaction.edit_original_response(content="Import complete.")
+            if failed_cases:
+                await interaction.edit_original_response(content="Import complete.\n*Failed to import the following cases:*\n```{failed_cases}```")
 
         @discord.ui.button(label="No", style=discord.ButtonStyle.danger)
         async def import_button_n(self, interaction: discord.Interaction, button: discord.ui.Button): # pylint: disable=unused-argument