--- a/dom/encoding/TextEncoder.cpp
+++ b/dom/encoding/TextEncoder.cpp
@@ -85,16 +85,20 @@ TextEncoder::Encode(JSContext* aCx,
     }
   }
 
   JSObject* outView = nullptr;
   if (NS_SUCCEEDED(rv)) {
     buf[dstLen] = '\0';
     outView = Uint8Array::Create(aCx, this, dstLen,
                                  reinterpret_cast<uint8_t*>(buf.get()));
+    if (!outView) {
+      aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+      return nullptr;
+    }
   }
 
   if (NS_FAILED(rv)) {
     aRv.Throw(rv);
   }
   return outView;
 }