From bd4c59cf34bfa4b1ae06839db70936786c5702df Mon Sep 17 00:00:00 2001
From: Kirill <vetrovk@gmail.com>
Date: Thu, 25 Jun 2026 14:59:33 +0300
Subject: [PATCH] Handle empty Generate Image mode (#2598)

---
 src/core/operations/GenerateImage.mjs |  4 ++++
 tests/operations/tests/Image.mjs      | 11 +++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/core/operations/GenerateImage.mjs b/src/core/operations/GenerateImage.mjs
index 053e4ba1..c276213d 100644
--- a/src/core/operations/GenerateImage.mjs
+++ b/src/core/operations/GenerateImage.mjs
@@ -74,6 +74,10 @@ class GenerateImage extends Operation {
             Bits: 1 / 8,
         };
 
+        if (!Object.hasOwn(bytePerPixelMap, mode)) {
+            throw new OperationError(`Unsupported Mode: (${mode})`);
+        }
+
         const bytesPerPixel = bytePerPixelMap[mode];
 
         if (bytesPerPixel > 0 && input.length % bytesPerPixel !== 0) {
diff --git a/tests/operations/tests/Image.mjs b/tests/operations/tests/Image.mjs
index 1f450433..fe6cab10 100644
--- a/tests/operations/tests/Image.mjs
+++ b/tests/operations/tests/Image.mjs
@@ -45,6 +45,17 @@ TestRegister.addTests([
             { op: "Render Image", args: ["Base64"] }
         ]
     },
+    {
+        name: "Generate Image: empty mode",
+        input: "",
+        expectedOutput: "Unsupported Mode: ()",
+        recipeConfig: [
+            {
+                op: "Generate Image",
+                args: ["", 8, 64]
+            }
+        ]
+    },
     {
         name: "Extract EXIF: nothing",
         input: "",