diff --git a/API/Controllers/ReaderController.cs b/API/Controllers/ReaderController.cs
index e53a5402f..f360151ad 100644
--- a/API/Controllers/ReaderController.cs
+++ b/API/Controllers/ReaderController.cs
@@ -62,7 +62,7 @@ public class ReaderController : BaseApiController
     {
         if (await _unitOfWork.UserRepository.GetUserIdByApiKeyAsync(apiKey) == 0) return BadRequest();
         var chapter = await _cacheService.Ensure(chapterId);
-        if (chapter == null) return BadRequest("There was an issue finding pdf file for reading");
+        if (chapter == null) return NoContent();
 
         // Validate the user has access to the PDF
         var series = await _unitOfWork.SeriesRepository.GetSeriesForChapter(chapter.Id,
@@ -101,7 +101,7 @@ public class ReaderController : BaseApiController
         if (page < 0) page = 0;
         if (await _unitOfWork.UserRepository.GetUserIdByApiKeyAsync(apiKey) == 0) return BadRequest();
         var chapter = await _cacheService.Ensure(chapterId, extractPdf);
-        if (chapter == null) return BadRequest("There was an issue finding image file for reading");
+        if (chapter == null) return NoContent();
 
         try
         {
@@ -125,7 +125,7 @@ public class ReaderController : BaseApiController
     {
         if (await _unitOfWork.UserRepository.GetUserIdByApiKeyAsync(apiKey) == 0) return BadRequest();
         var chapter = await _cacheService.Ensure(chapterId, true);
-        if (chapter == null) return BadRequest("There was an issue extracting images from chapter");
+        if (chapter == null) return NoContent();
         var images = _cacheService.GetCachedPages(chapterId);
 
         var path = await _readerService.GetThumbnail(chapter, pageNum, images);
@@ -148,7 +148,7 @@ public class ReaderController : BaseApiController
     {
         if (page < 0) page = 0;
         var userId = await _unitOfWork.UserRepository.GetUserIdByApiKeyAsync(apiKey);
-        if (userId == 0) return BadRequest();
+        if (userId == 0) return Unauthorized();
 
         var totalPages = await _cacheService.CacheBookmarkForSeries(userId, seriesId);
         if (page > totalPages)
@@ -185,7 +185,7 @@ public class ReaderController : BaseApiController
     {
         if (chapterId <= 0) return ArraySegment<FileDimensionDto>.Empty;
         var chapter = await _cacheService.Ensure(chapterId, extractPdf);
-        if (chapter == null) return BadRequest("Could not find Chapter");
+        if (chapter == null) return NoContent();
         return Ok(_cacheService.GetCachedFileDimensions(_cacheService.GetCachePath(chapterId)));
     }
 
@@ -203,7 +203,7 @@ public class ReaderController : BaseApiController
     {
         if (chapterId <= 0) return Ok(null); // This can happen occasionally from UI, we should just ignore
         var chapter = await _cacheService.Ensure(chapterId, extractPdf);
-        if (chapter == null) return BadRequest("Could not find Chapter");
+        if (chapter == null) return NoContent();
 
         var dto = await _unitOfWork.ChapterRepository.GetChapterInfoDtoAsync(chapterId);
         if (dto == null) return BadRequest("Please perform a scan on this series or library and try again");
diff --git a/API/Controllers/SeriesController.cs b/API/Controllers/SeriesController.cs
index c729e7017..a26718297 100644
--- a/API/Controllers/SeriesController.cs
+++ b/API/Controllers/SeriesController.cs
@@ -64,16 +64,9 @@ public class SeriesController : BaseApiController
     public async Task<ActionResult<SeriesDto>> GetSeries(int seriesId)
     {
         var userId = await _unitOfWork.UserRepository.GetUserIdByUsernameAsync(User.GetUsername());
-        try
-        {
-            return Ok(await _unitOfWork.SeriesRepository.GetSeriesDtoByIdAsync(seriesId, userId));
-        }
-        catch (Exception e)
-        {
-            _logger.LogError(e, "There was an issue fetching {SeriesId}", seriesId);
-            throw new KavitaException("This series does not exist");
-        }
-
+        var series = await _unitOfWork.SeriesRepository.GetSeriesDtoByIdAsync(seriesId, userId);
+        if (series == null) return NoContent();
+        return Ok(series);
     }
 
     [Authorize(Policy = "RequireAdminRole")]
@@ -114,13 +107,16 @@ public class SeriesController : BaseApiController
     public async Task<ActionResult<VolumeDto?>> GetVolume(int volumeId)
     {
         var userId = await _unitOfWork.UserRepository.GetUserIdByUsernameAsync(User.GetUsername());
-        return Ok(await _unitOfWork.VolumeRepository.GetVolumeDtoAsync(volumeId, userId));
+        var vol = await _unitOfWork.VolumeRepository.GetVolumeDtoAsync(volumeId, userId);
+        if (vol == null) return NoContent();
+        return Ok(vol);
     }
 
     [HttpGet("chapter")]
     public async Task<ActionResult<ChapterDto>> GetChapter(int chapterId)
     {
         var chapter = await _unitOfWork.ChapterRepository.GetChapterDtoAsync(chapterId);
+        if (chapter == null) return NoContent();
         return Ok(await _unitOfWork.ChapterRepository.AddChapterModifiers(User.GetUserId(), chapter));
     }
 
diff --git a/API/Data/Repositories/SeriesRepository.cs b/API/Data/Repositories/SeriesRepository.cs
index 04215c9ca..32cd0deea 100644
--- a/API/Data/Repositories/SeriesRepository.cs
+++ b/API/Data/Repositories/SeriesRepository.cs
@@ -80,7 +80,7 @@ public interface ISeriesRepository
     /// <returns></returns>
     Task<SearchResultGroupDto> SearchSeries(int userId, bool isAdmin, IList<int> libraryIds, string searchQuery);
     Task<IEnumerable<Series>> GetSeriesForLibraryIdAsync(int libraryId, SeriesIncludes includes = SeriesIncludes.None);
-    Task<SeriesDto> GetSeriesDtoByIdAsync(int seriesId, int userId);
+    Task<SeriesDto?> GetSeriesDtoByIdAsync(int seriesId, int userId);
     Task<Series?> GetSeriesByIdAsync(int seriesId, SeriesIncludes includes = SeriesIncludes.Volumes | SeriesIncludes.Metadata);
     Task<IList<Series>> GetSeriesByIdsAsync(IList<int> seriesIds);
     Task<int[]> GetChapterIdsForSeriesAsync(IList<int> seriesIds);
@@ -442,11 +442,13 @@ public class SeriesRepository : ISeriesRepository
         return result;
     }
 
-    public async Task<SeriesDto> GetSeriesDtoByIdAsync(int seriesId, int userId)
+    public async Task<SeriesDto?> GetSeriesDtoByIdAsync(int seriesId, int userId)
     {
         var series = await _context.Series.Where(x => x.Id == seriesId)
             .ProjectTo<SeriesDto>(_mapper.ConfigurationProvider)
-            .SingleAsync();
+            .SingleOrDefaultAsync();
+
+        if (series == null) return null;
 
         var seriesList = new List<SeriesDto>() {series};
         await AddSeriesModifiers(userId, seriesList);
diff --git a/API/Data/Repositories/VolumeRepository.cs b/API/Data/Repositories/VolumeRepository.cs
index a849ab7f0..95470a963 100644
--- a/API/Data/Repositories/VolumeRepository.cs
+++ b/API/Data/Repositories/VolumeRepository.cs
@@ -9,6 +9,7 @@ using API.Extensions;
 using API.Services;
 using AutoMapper;
 using AutoMapper.QueryableExtensions;
+using Kavita.Common;
 using Microsoft.EntityFrameworkCore;
 
 namespace API.Data.Repositories;