diff --git a/api/server/services/Files/process.js b/api/server/services/Files/process.js
index 8910163047..38ccdafdd7 100644
--- a/api/server/services/Files/process.js
+++ b/api/server/services/Files/process.js
@@ -55,7 +55,9 @@ const processFiles = async (files, fileIds) => {
   }
 
   if (!fileIds) {
-    return await Promise.all(promises);
+    const results = await Promise.all(promises);
+    // Filter out null results from failed updateFileUsage calls
+    return results.filter((result) => result != null);
   }
 
   for (let file_id of fileIds) {
@@ -67,7 +69,9 @@ const processFiles = async (files, fileIds) => {
   }
 
   // TODO: calculate token cost when image is first uploaded
-  return await Promise.all(promises);
+  const results = await Promise.all(promises);
+  // Filter out null results from failed updateFileUsage calls
+  return results.filter((result) => result != null);
 };
 
 /**
diff --git a/api/server/services/Files/processFiles.test.js b/api/server/services/Files/processFiles.test.js
new file mode 100644
index 0000000000..8665d33665
--- /dev/null
+++ b/api/server/services/Files/processFiles.test.js
@@ -0,0 +1,208 @@
+// Mock the updateFileUsage function before importing the actual processFiles
+jest.mock('~/models/File', () => ({
+  updateFileUsage: jest.fn(),
+}));
+
+// Mock winston and logger configuration to avoid dependency issues
+jest.mock('~/config', () => ({
+  logger: {
+    info: jest.fn(),
+    warn: jest.fn(),
+    debug: jest.fn(),
+    error: jest.fn(),
+  },
+}));
+
+// Mock all other dependencies that might cause issues
+jest.mock('librechat-data-provider', () => ({
+  isUUID: { parse: jest.fn() },
+  megabyte: 1024 * 1024,
+  FileContext: { message_attachment: 'message_attachment' },
+  FileSources: { local: 'local' },
+  EModelEndpoint: { assistants: 'assistants' },
+  EToolResources: { file_search: 'file_search' },
+  mergeFileConfig: jest.fn(),
+  removeNullishValues: jest.fn((obj) => obj),
+  isAssistantsEndpoint: jest.fn(),
+}));
+
+jest.mock('~/server/services/Files/images', () => ({
+  convertImage: jest.fn(),
+  resizeAndConvert: jest.fn(),
+  resizeImageBuffer: jest.fn(),
+}));
+
+jest.mock('~/server/controllers/assistants/v2', () => ({
+  addResourceFileId: jest.fn(),
+  deleteResourceFileId: jest.fn(),
+}));
+
+jest.mock('~/models/Agent', () => ({
+  addAgentResourceFile: jest.fn(),
+  removeAgentResourceFiles: jest.fn(),
+}));
+
+jest.mock('~/server/controllers/assistants/helpers', () => ({
+  getOpenAIClient: jest.fn(),
+}));
+
+jest.mock('~/server/services/Tools/credentials', () => ({
+  loadAuthValues: jest.fn(),
+}));
+
+jest.mock('~/server/services/Config', () => ({
+  checkCapability: jest.fn(),
+}));
+
+jest.mock('~/server/utils/queue', () => ({
+  LB_QueueAsyncCall: jest.fn(),
+}));
+
+jest.mock('./strategies', () => ({
+  getStrategyFunctions: jest.fn(),
+}));
+
+jest.mock('~/server/utils', () => ({
+  determineFileType: jest.fn(),
+}));
+
+// Import the actual processFiles function after all mocks are set up
+const { processFiles } = require('./process');
+const { updateFileUsage } = require('~/models/File');
+
+describe('processFiles', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('null filtering functionality', () => {
+    it('should filter out null results from updateFileUsage when files do not exist', async () => {
+      const mockFiles = [
+        { file_id: 'existing-file-1' },
+        { file_id: 'non-existent-file' },
+        { file_id: 'existing-file-2' },
+      ];
+
+      // Mock updateFileUsage to return null for non-existent files
+      updateFileUsage.mockImplementation(({ file_id }) => {
+        if (file_id === 'non-existent-file') {
+          return Promise.resolve(null); // Simulate file not found in the database
+        }
+        return Promise.resolve({ file_id, usage: 1 });
+      });
+
+      const result = await processFiles(mockFiles);
+
+      expect(updateFileUsage).toHaveBeenCalledTimes(3);
+      expect(result).toEqual([
+        { file_id: 'existing-file-1', usage: 1 },
+        { file_id: 'existing-file-2', usage: 1 },
+      ]);
+
+      // Critical test - ensure no null values in result
+      expect(result).not.toContain(null);
+      expect(result).not.toContain(undefined);
+      expect(result.length).toBe(2); // Only valid files should be returned
+    });
+
+    it('should return empty array when all updateFileUsage calls return null', async () => {
+      const mockFiles = [{ file_id: 'non-existent-1' }, { file_id: 'non-existent-2' }];
+
+      // All updateFileUsage calls return null
+      updateFileUsage.mockResolvedValue(null);
+
+      const result = await processFiles(mockFiles);
+
+      expect(updateFileUsage).toHaveBeenCalledTimes(2);
+      expect(result).toEqual([]);
+      expect(result).not.toContain(null);
+      expect(result.length).toBe(0);
+    });
+
+    it('should work correctly when all files exist', async () => {
+      const mockFiles = [{ file_id: 'file-1' }, { file_id: 'file-2' }];
+
+      updateFileUsage.mockImplementation(({ file_id }) => {
+        return Promise.resolve({ file_id, usage: 1 });
+      });
+
+      const result = await processFiles(mockFiles);
+
+      expect(result).toEqual([
+        { file_id: 'file-1', usage: 1 },
+        { file_id: 'file-2', usage: 1 },
+      ]);
+      expect(result).not.toContain(null);
+      expect(result.length).toBe(2);
+    });
+
+    it('should handle fileIds parameter and filter nulls correctly', async () => {
+      const mockFiles = [{ file_id: 'file-1' }];
+      const mockFileIds = ['file-2', 'non-existent-file'];
+
+      updateFileUsage.mockImplementation(({ file_id }) => {
+        if (file_id === 'non-existent-file') {
+          return Promise.resolve(null);
+        }
+        return Promise.resolve({ file_id, usage: 1 });
+      });
+
+      const result = await processFiles(mockFiles, mockFileIds);
+
+      expect(result).toEqual([
+        { file_id: 'file-1', usage: 1 },
+        { file_id: 'file-2', usage: 1 },
+      ]);
+      expect(result).not.toContain(null);
+      expect(result).not.toContain(undefined);
+      expect(result.length).toBe(2);
+    });
+
+    it('should handle duplicate file_ids correctly', async () => {
+      const mockFiles = [
+        { file_id: 'duplicate-file' },
+        { file_id: 'duplicate-file' }, // Duplicate should be ignored
+        { file_id: 'unique-file' },
+      ];
+
+      updateFileUsage.mockImplementation(({ file_id }) => {
+        return Promise.resolve({ file_id, usage: 1 });
+      });
+
+      const result = await processFiles(mockFiles);
+
+      // Should only call updateFileUsage twice (duplicate ignored)
+      expect(updateFileUsage).toHaveBeenCalledTimes(2);
+      expect(result).toEqual([
+        { file_id: 'duplicate-file', usage: 1 },
+        { file_id: 'unique-file', usage: 1 },
+      ]);
+      expect(result.length).toBe(2);
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should handle empty files array', async () => {
+      const result = await processFiles([]);
+      expect(result).toEqual([]);
+      expect(updateFileUsage).not.toHaveBeenCalled();
+    });
+
+    it('should handle mixed null and undefined returns from updateFileUsage', async () => {
+      const mockFiles = [{ file_id: 'file-1' }, { file_id: 'file-2' }, { file_id: 'file-3' }];
+
+      updateFileUsage.mockImplementation(({ file_id }) => {
+        if (file_id === 'file-1') return Promise.resolve(null);
+        if (file_id === 'file-2') return Promise.resolve(undefined);
+        return Promise.resolve({ file_id, usage: 1 });
+      });
+
+      const result = await processFiles(mockFiles);
+
+      expect(result).toEqual([{ file_id: 'file-3', usage: 1 }]);
+      expect(result).not.toContain(null);
+      expect(result).not.toContain(undefined);
+      expect(result.length).toBe(1);
+    });
+  });
+});