diff --git a/packages/server/src/integrations/tests/rest.spec.ts b/packages/server/src/integrations/tests/rest.spec.ts
index 7273a2d178..144aefa576 100644
--- a/packages/server/src/integrations/tests/rest.spec.ts
+++ b/packages/server/src/integrations/tests/rest.spec.ts
@@ -4,7 +4,11 @@ jest.mock("node-fetch", () => {
       raw: () => {
         return { "content-type": ["application/json"] }
       },
-      get: () => ["application/json"],
+      get: (name: string) => {
+        if (name.toLowerCase() === "content-type") {
+          return ["application/json"]
+        }
+      },
     },
     json: jest.fn(() => ({
       my_next_cursor: 123,
@@ -211,7 +215,16 @@ describe("REST Integration", () => {
         json: json ? async () => json : undefined,
         text: text ? async () => text : undefined,
         headers: {
-          get: (key: any) => (key === "content-length" ? 100 : header),
+          get: (key: string) => {
+            switch (key.toLowerCase()) {
+              case "content-length":
+                return 100
+              case "content-type":
+                return header
+              default:
+                return ""
+            }
+          },
           raw: () => ({ "content-type": header }),
         },
       }
diff --git a/packages/server/src/integrations/utils/restUtils.ts b/packages/server/src/integrations/utils/restUtils.ts
index 42c8e939eb..2da9307071 100644
--- a/packages/server/src/integrations/utils/restUtils.ts
+++ b/packages/server/src/integrations/utils/restUtils.ts
@@ -7,18 +7,20 @@ export function getAttachmentHeaders(headers: Headers) {
   // the API does not follow the requirements of https://www.ietf.org/rfc/rfc2183.txt
   // all content-disposition headers should be format disposition-type; parameters
   // but some APIs do not provide a type, causing the parse below to fail - add one to fix this
-  const quotesRegex = /"(?:[^"\\]|\\.)*"|;/g
-  let match: RegExpMatchArray | null = null,
-    found = false
-  while ((match = quotesRegex.exec(contentDisposition)) !== null) {
-    if (match[0] === ";") {
-      found = true
+  if (contentDisposition) {
+    const quotesRegex = /"(?:[^"\\]|\\.)*"|;/g
+    let match: RegExpMatchArray | null = null,
+      found = false
+    while ((match = quotesRegex.exec(contentDisposition)) !== null) {
+      if (match[0] === ";") {
+        found = true
+      }
     }
-  }
-  if (!found) {
-    return {
-      contentDisposition: `attachment; ${contentDisposition}`,
-      contentType,
+    if (!found) {
+      return {
+        contentDisposition: `attachment; ${contentDisposition}`,
+        contentType,
+      }
     }
   }