diff --git a/src/core/image.js b/src/core/image.js
index 1c3c721c7..af0bf6f4a 100644
--- a/src/core/image.js
+++ b/src/core/image.js
@@ -275,12 +275,16 @@ class PDFImage {
     const mask = image.dict.get("Mask");
 
     if (smask) {
-      smaskData = smask;
+      if (smask instanceof BaseStream) {
+        smaskData = smask;
+      } else {
+        warn("Unsupported /SMask format.");
+      }
     } else if (mask) {
       if (mask instanceof BaseStream || Array.isArray(mask)) {
         maskData = mask;
       } else {
-        warn("Unsupported mask format.");
+        warn("Unsupported /Mask format.");
       }
     }
 
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 2306c1674..237950224 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -505,6 +505,7 @@
 !poppler-85140-0.pdf
 !poppler-395-0-fuzzed.pdf
 !GHOSTSCRIPT-698804-1-fuzzed.pdf
+!issue14814.pdf
 !poppler-91414-0-53.pdf
 !poppler-91414-0-54.pdf
 !poppler-742-0-fuzzed.pdf
diff --git a/test/pdfs/issue14814.pdf b/test/pdfs/issue14814.pdf
new file mode 100644
index 000000000..ce29ab3cd
Binary files /dev/null and b/test/pdfs/issue14814.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 9465e2712..ddccfd301 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -98,6 +98,13 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue14814",
+       "file": "pdfs/issue14814.pdf",
+       "md5": "a1c8b677335ff5ea0d07e35e7dffb6e8",
+       "rounds": 1,
+       "firstPage": 2,
+       "type": "eq"
+    },
     {  "id": "issue14269",
        "file": "pdfs/issue14269.pdf",
        "md5": "f34abf77a418f54e13fbcd03b063432e",